for every row, but RAND() is called only once per statement. You can use an update trigger to modify existing rows, and an insert trigger to generate random numbers for new rows. I am trying to show that Row 1 above was renewed by row 2 was replaced by row 4 and row4 has not been renewed as yet. update table_name set column_name= round (dbms_random.value ( 1, 100 )); you don't have to loop, this single update statement will satisfy your need per your request above. generate_series could give you rows from 1 to 5. Asking for help, clarification, or responding to other answers. So you can define it as random_num int null unique. We can use the built-in function RAND() to generate random number.21-Jun-2019. Since my table is small I dont think I need to use a string or a UUID so I went with. update records randomly sql. Here's a simple way to do it. How do I attach an excel file so you can see what the actual output needs to be? The below script can generate a random number based on the range of yours. 2. tablename. This statement appears to yield random values for each row as I was looking for. Pseudo-random and unique (in a small DB) sounds more plausable, doesnt it. Why does Cauchy's equation for refractive index contain only even power terms? What I intially wanted when I asked the question was some help of how to 'kind of' put the above query in an UPDATE one. 1. column_name. Find centralized, trusted content and collaborate around the technologies you use most. update MyTable set SomeValue = rand () This is because SQL Server only runs the . Update YourTable Set YourColumn = (abs(cast(newid() as binary(6)) %90000) + 10000)/100. Where WeightScaled >= @RandomNumber. You can update all rows in the table with: update table1 set random_num = null where 1 = 1; Note that the column random_num must be nullable. It's using the same random number because the subquery only needs to run once for the UPDATE. Join your @MyRandomVal1 to MyTable2 on true. I am trying to show that Row 1 above was renewed by row 2 was replaced by row 4 and row4 has not been renewed as yet. Generate a random integer between a range. RLF. You do it in a loop and leave the loop as soon as you find a new (unique) number. You may need random numbers in integer format. Thanks for contributing an answer to Stack Overflow! After the EDIT we assume that cardinality of TableB can also be smaller than cardinality of TableA, so we 1st need to multiply TableB rows enough to be more then TableA rows (tables Cnt and numbers) and then use the numbers table in TblB to multiply the rows. However - you should not try to insert more rows than the number of possible unique numbers :-). Simply join against c1. we use a variable that increments for each line. To select a random value for each row in a table, do. Random string generation with upper case letters and digits, Generate random number between two numbers in JavaScript. I need to add some test data to a table that already contains x number of rows. This works for SQL Server 2005. My work as a freelance was used in a scientific paper, should I be included as an author? So to join on the data_records you would need a 1 to 5 column there too. I was thinking the same earlier, but that makes every row the same random number. Generating random numbers is very simple in SQL Server. We need to add a random info to TableB that will be used both to obfuscate ELEMENT and to shuffle the order. Order by WeightScaled ASC. Is it appropriate to ignore emails from a student asking obvious questions? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. It therefore generates a pseudo random value. UPDATE a column in every row with a random unique number, MySql - Update table using select statment from same table. . That still does not gurantee that it doesnt conflict. cteTable1, cteTable2, table1, and table2. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. This approach may lead one to believe that each row would have a . I use SQL server with an express 2014 version. First of all we must be sure that cardinality of TableB MUST BE greater than or equal to cardinality of TableA. If this is what is saved in c1 there's no problem. Here is a correction to my original query that should fix that: It would help if you mention the data types of the columns and the # of rows in the tables and how frequently this is run. (SQL 2005), Kalman Toth SQL SERVER 2012 & BI TRAINING Help us identify new roles for community members, Update specific records of table based on subquery's output (sql server), Update all rows from a table with random foreign key from another table, Remove parent and child rows if child or parent fits criteria, Update field in SQL Server Table Dynamicaly, SQL - Update certain database records with a loop. How do I generate a random number in T SQL? how to update table rows with random number values. sql update random value for rows. The table is called Renewals. For other ranges, just change the values of the two variables. As you have it now, its possible for two different rows to have the same number in the random_uid column. Japanese girlfriend visiting me in Canada - questions at border control? As MD5 is not infinite, you could obtain the same hash from two different strings; you can solve it by concatening the original id to the MD5 string, because that id is unique. The trigger will take care of it. For each row we returned, the server performed a few other actions, including another SQL query and data manipulation. Limitation 3: We Can Only Return a Limited Number Of Rows In Each Request. I am using this data to update the previous row. There is a way to get separate random numbers for each row using NEWID. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You have to use trick programmming, it is called multiple-value assignment. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Sample follows, see the SET clause: RBarryYoung a few questions for clarification looks like you reference 4 tables in the above. It only takes a minute to sign up. Similarly to generate a random number between 24 and 123, use this query: UPDATE @TT SET DayAlloted = ABS(CHECKSUM(NEWID())) % 100 + 24 There are other ways to generate the random number within a range and this is just one of them. Or how could I randomize my rowID column so that say 10% of the rows (230 rows) have a value of 0? The solutions often use the GUID generated by NEWID () as the seed. Occasionally you need to update a table with a random value per row. In the United States, must state courts follow rulings by federal courts of appeals? But if I will make random numbers for each row and column, it is not so random as I want it. But it can be UNIQUE. While there is a RAND () function that returns a random number between 0 and 1 that can be manipulated to any other range, it is not effective to update multiple rows with one update statement since it is executed only once per statement, not once per row. How to make voltage plus/minus signs bolder? Better way to check if an element only exists in one array. I have a small table of about 20k rows. the passed arguments 1,100 are the lower and upper limit for generating random numbers. Thanks! Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? In the trigger body you generate a random number and check if it already exist in the table. tobzzz. It even works fine with bulk inserts: Note that I use FLOOR(RAND() * 10) in the demo to demonstrate the uniqueness on a small range. You may even need random numbers between two integers. You can update all rows in the table with: Note that the column random_num must be nullable. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? You can also use the symbol (*) to get the random data from all the columns of a table. I'm trying to update multiple rows in one column and one tablewith a random values from another table. Since you only need to do this step once, you can now drop that trigger. If this is the only reason for the previous update, we don't have to update the table at all. [] I am trying to show that Row 1 above was renewed by row 2 was replaced by row 4 and row4 has not been renewed as yet. To learn more, see our tips on writing great answers. But if not you have to generate it, maybe with a row_number window function which adds the row count as column. Plus, doing it in sql2000 will help me understand the underlying concept How many transistors at minimum do you need to build a general-purpose computer? Does aliquot matter for final concentration? Instead, start a new thread. If a SQL statement calls RANDOM more than once with the same seed for the same row, then RANDOM returns the same value for each call for that row. It turns out though, that I need to have some 0 values too. After it, I am going to use the UPDATE statement. It's using the same random number because the subquery only needs to run once for the UPDATE. Connect and share knowledge within a single location that is structured and easy to search. Radial velocity of host stars and exoplanets. 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How about my solution? What is the highest level 1 persuasion bonus you can have? The ROW_NUMBER () function can be used for pagination. The query generates a random number between 1 and 10. Of course this could be the c2. Is there a way to do this with an In the United States, must state courts follow rulings by federal courts of appeals? You actually don't need a subquery. If he had met some scary fish, he would immediately return to the surface, Arbitrary shape cut into triangles and packed into rectangle of the same area. Follow edited Oct 24, 2015 at 19:36. To create a random integer number between two values (range), you can use the following formula: SELECT FLOOR(RAND . One way to do it is with a cte. The column I need to update is a money column. But you could query the table with a self join like: I don't know if I should laugh or cry.. why is it so complicated to perform simple loops in SQL? To shuffle the order we will number TableA.ID and the new random column in TableBadding a sort of interface between them. And thanks to some optimizations SQL Server does, it's not exactly straight forward. To generate a random integer R in the range (n,m), n <= R < m, you use the RAND function in conjunction with the ROUND function as follows: ROUND (n + RAND () * (m n)) Code language: SQL (Structured Query Language) (sql) For example, to get a random number between 1 and 100, you use the following . What I really want to do is to add random values like between 100 and 1000. refer to MySql - Update table using select statment from same table. sql update with random value from another table. Were sorry. how to generate random numbers from 500 to 3000 or say whatever my range is? P.S. Add a row number that is ordered by newid(). It is not for anything security related so I dont believe that is an issue, unless am overlooking something that is. NEWID () is a uniqueidentifier with 16 byte hexadecimal digits. How do I do this? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. That's a good point, Sankar, I had missed that there where only 7 records in table2. Note: I have edited the code in my previous post to correct a possible code problem (ie., it needs that leading semicolon, if the previous statement was not terminated with a semicolon). update set random numbe sql. To answer the question in the comment of this answer: I am using this data to update the previous row. like 5,1,45,64,23 etc. Is there a random function? All Rights Reserved. sql-server; random; Share. ASKER. How can I do an UPDATE statement with JOIN in SQL Server? In this mode, ELEMENT could be repeated across rows, but random part will be different. I would really recommend doing this another way, e.g. Youll be auto redirected in 1 second. You can pass it a seed or have SQL Server determine a seed for you. Take a look at SQL Server - Set based random numbers which has a very detailed explanation. My problem is that I cant update and select from the same table, so I was having trouble creating the UPDATE query. In other words, the SQL engine knows that the inner SELECT only needs to be run once for the query; it does so, and uses the resultant value for each row. Update n random rows in SQL. It depends on the NEWID() function which is intended to generate uniqueidentifiers. One possibility is to remove the subquery: This should re-run random() for every row being updated. Each time you execute the statement, it returns different random values. The highest value would occur when RANDOM() returns something like 0.999999, which would give a value slightly below 30000079. I need to update a column with an sequential number starting with 1 based on the accountId in the table. Assuming you are looking for integer values >= 500 and <= 3000, then. How do I assign a random number to each row in SQL? Making statements based on opinion; back them up with references or personal experience. I use the SQL Server function rand () to generate a random number. Then you are able to join the row count against the generated_series column and you have a row with a random value for each c1 and c2. The above does not gurantee that. I filled a test table with 512 rows, then did this: The numbers are now randomly assigned to rows, but each row has a unique value. This is good enough in my case but not in general, depending on your constraints. On executing the SELECT RAND (5) statement with the specified seed value multiple times, the values you get are the same. So, for example Update <setle> set <column> = Rand () In that table there is a column named random_uid (INT NOT NULL). How is Jesus God when he sits at the right hand of the true God? This generates a random number between 0 and 9999. Is there a higher analog of "category with all same side inverses is a groupoid"? The INSERT trigger has the same body. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It appears to be the simplest? In my case when i'd add a row, i just add a random_uid that is equal to the number of elements in the table, so N (cause i start from 0). Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? Conducted testing on 2M records, 100 iterations. How is Jesus God when he sits at the right hand of the true God? When we tried to retrieve a large number of rows, the request was timed out. Assuming the field is called 'uuid_field' and is a varchar, here's the trigger: If you have an unique ID, you could do something like this: First of all, create a random value based on the MD5 string of your id and the current full datetime. How to loop through all table rows and perform subquery using values of same row? Generating Random Numbers For All Rows in a Query and Other Funky Stuff You Can Do With Them UPDATE: Check out Generate a Random Number for Each Row in a Query {a better way} for an alternative method that I now use for generating random numbers using CRYPT_GEN_RANDOM Or do I need a cursor? be helpful to include a link to that old thread, but you want to ask your question in a new thread. The reason I havent accepted the answer is because I tested it, and it while it works, generates pseudo-random numbers and update the columns, the numbers are NOT unique! Select @RandomNumber = rand () * @MaxValue. so for each row of AccountID I need to update the OrderID to start from 1 and sequentially update so my data comes out like this. (SELECT @rn1:=-1) as t3 cross join is equivalent to set @rn1:=-1; we use the cross join trick to put the two statements in only one line. Because of the select that am using to verify that the same number doesnt already exist in another row, I cant use UPDATE, thats the issue. Update Table Column With Different Random Numbers. It can also take an optional seed parameter which is an integer expression (tinyint, smallint or int) that gives the seed. This solves the problem of populating the random_uid for all the table. confusion between a half wave and a centre tapped full wave rectifier. The content you requested has been removed. I didn't know if there was a column that was unique. With 20K rows and 100M possible unique numbers the loop will need like 1.0002 (average) iteratons per row. what is the maximum value in the random_uid field? I just tried it on a sql2008 DB. Enter your required column names from where you want to retrieve the random rows. Visit Microsoft Q&A to post new questions. First, use the ROW_NUMBER () function to assign each row a sequential integer number. Specify the table name from which the random data will come. In the query above, this means that the smallest value would occur when RANDOM() returns 0, giving 1 as the value. Edit: If you just try to update with a random value like this, every row ends up with the same 'random' value. Second, filter rows by requested page. Here's a simple DEMO since we don't have example data. But if they are not unique you would end with same random values for same c1/c2 values: It would be really more simple if you would have an unique id column. Thanks for this tip. Better way to check if an element only exists in one array, Arbitrary shape cut into triangles and packed into rectangle of the same area. This will get the same results as above: You can just create a view I would like to update all 20k rows with a random unique number. One way to get random numbers from 100.00 to 1000.00. That method should work equally well in SQL 2000. Thanks for contributing an answer to Database Administrators Stack Exchange! Then get all the rownumber 1's. For example: Postgres' RANDOM() function returns a number in the range 0.0 <= x < 1.0. How do we know the true value of a parameter, in order to check estimator properties? sql update column on all rows to random number. Designed by Colorlib. It won't be as random while assigning values to subsequently inserted rows, though. The usual way is to use the modulo of the checksum. How can you know the sky Rose saw when the Titanic sunk? rev2022.12.11.43106. You can generate a random sequence of the first N integer numbers and update your table with that (where N is the number of rows in your table). SQL RAND function is a mathematical function which returns a pseudo-random float value from 0 through 1, exclusive or a random value within any range. Ready to optimize your JavaScript with Rust? Using a common table expression with row_number() to partition by AccountId and order by [RowId]: Without using the common table expression: test setup: http://rextester.com/FSUD49402. I would use the ROWID: UPDATE xyz SET x='Y' WHERE rowid IN ( SELECT r FROM ( SELECT ROWID r FROM xyz ORDER BY dbms_random.value ) RNDM WHERE rownum < n+1 ) The actual reason I would use ROWID isn't for efficiency though (it will still do a full table scan) - your SQL may not update the number of . If you need it for SQL Server 2000, let me know and I can convert it. UPDATE myTable SET randomNo = cint (rnd (id))*1000 + 1. to get a random number between 001-999. The FLOOR function would take it down to 30000078, but then we add 1 to it to bring it back to 30000079, your highest value. Can several CRTs be wired in parallel to one oscilloscope circuit? Borrowing from @BillKarwin , UUIDs provide a way to get random and Unique fields in databases, and Mysql8 has some partial but totally workable support. One of them should be unique. Visit Microsoft Q&A to post new questions. Random number generator only generating one random number, Select n random rows from SQL Server table. The test is successful. But nevertheless I don't see any reasons for making this that complicated. Does integrating PDOS give total charge of a system? Probably the easiest way to do this is to run this query repeatedly: If you're working in MySQL Workbench, you can create a temporary procedure to do it for you, like this: This is really just a brute-force way of doing it, and there are all sorts of ways you could optimize for performance, but this gets the job done, quick-and-dirty. You'll want to check the logic in the PARTITION BY. Can be done with: select r.* , RenewedBy=p.RowId from Renewals as r left join Renewals as p on p.AccountId = r.AccountId and p.OrderId = r.OrderId+1 returns: It works better than RAND() because NEWID() is called once Sample run. Where does the idea of selling dragon parts come from? Connect and share knowledge within a single location that is structured and easy to search. The final limitation was the most difficult to overcome: a timeout issue. INSERT trigger This forum has migrated to Microsoft Q&A. While there is a RAND () function that returns a random number between 0 and 1 that can be manipulated to any other range, it is not effective to update multiple rows with one update statement since it is executed only once per statement, not once per row. If you want the second column with the generate_series (for whatever) you will need something to join on the original table. Can you explain what these other tables are? update query random date sql server. will set the column value in every row to the same value. Asking for help, clarification, or responding to other answers. In other words, the SQL engine knows that the inner SELECT only needs to be run once for the query; it does so, and uses the resultant value for each row. UPDATE myTable SET randomNo = rnd (id) to get a value 0.0000-0.9999, or. 13.9k 2 2 gold badges 31 31 silver badges 44 44 bronze badges. Not the answer you're looking for? If not you may have to partition by all columns since we are joining each row to every row in the random value table. builds the random sequence of N numbers. So this generates the sequence from 0 to N-1 and scrambles it with order by Rand(), we augment this table with a row number by. After the above query, each uuid_field has a universally unique id. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, I am using this data to update the previous row. Can we keep alcoholic beverages indefinitely? How can you know the sky Rose saw when the Titanic sunk? 3/18/2010. I do not have an issue with the above randomness, since I am not using this for any security purpoces, simply to create unique ids for each row that are not just incremented. Finding the original ODE using a solution. update query? It does randomize between 100 and 1000. Update YourTable Set YourColumn = (abs(cast(newid() as binary(6)) %90000) + 10000)/100. It's as if nobody ever expected to iterate over data when SQL was designed, so now people are forced to find weird tricks to get it done. update each row with random number sql. From BANNER_Ads. This forum has migrated to Microsoft Q&A. SQLZIM you are a star - this does exactly what I want to achieve. New Book: Beginner Database Design & SQL Programming Using Microsoft SQL Server 2012, data type in column1 and column A are datetime (recall I'm just trying to randomly populate table1.column1 with values from table2.columnA)There are about 3000 rows in table1 and 7 rows in table2. The best answers are voted up and rise to the top, Not the answer you're looking for? Instead of rand(), use newid(), which is recalculated for each row in the result. How do I (or can I) SELECT DISTINCT on multiple columns? Does aliquot matter for final concentration? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why is the federal judiciary of the United States divided into circuits? Making statements based on opinion; back them up with references or personal experience. Each row must be unique. Can i put a b-link on a standard mount rear derailleur to fit my direct mount frame, Radial velocity of host stars and exoplanets. WITH cteTable1 AS ( SELECT ROW_NUMBER () OVER (ORDER BY NEWID ()) AS n, colum1 FROM table1 ), cteTable2 AS ( SELECT ROW_NUMBER () OVER (ORDER BY NEWID ()) AS n, columnA FROM table2 ) UPDATE cteTable1 SET column1 = ( SELECT columnA FROM cteTable2 WHERE cteTable1.n = cteTable2.n) This works for SQL Server 2005. [.] When you insert new rows, you don't need to set the random_num column. SELECT RAND (); SELECT RAND (5); As you can see, in the first example, the RAND () function generates a random number in decimals between 0 to 1. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? I am sorry for not mentioning, I will update my post to reflect that, but I have used the NOT IN because I need the numbers to be unique. There are more efficient ways of storing these by packing them into binary of 16-bytes size, but that is outside the scope of this post -- there are other posts online that explain how to pack uuids. To obfuscate ELEMENT we will strip portions of our random info. For this purpose we will add a UNIQUEIDENTIFIER column with random values from NEWID() function. with UUIDs. update random number in a column sql. Ready to optimize your JavaScript with Rust? This unique column (c1 in my case) works as the WHERE filter of the UPDATE clause. Some solutions use the RAND function in conjunction with the NEWID () to create a random number for each row in a table. we augment the original table with the row number in similar way: and we join the two parts using the row number: We effectively built a table with a column containing the id, and another column containing the random_uid (called rnd_id) mentioned on the question. In my opinion this is the best suitable answer for the question. Should set (approximately) 10% of the values to 0 and randomly distribute the other 90% between 100 and 1000. Now just have to do the update in my master table, How do I Loop through a table and update a field in SQL. I have seen this problem in other databases, where a subquery gets "optimized away" even though it has a volatile function in it. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It is efficient and you don't have to update Renewal with any change. See the example below. Since you only need to do this step once, you can now drop that trigger. so OrderID is NULL to start. At this point we can proceed with the update, augmenting the table with our new rnd_id table and setting the random_uid in the original table (called here random_id) equal to rnd_id: Regarding the trouble in using an update and select with the same table, i think the trick is to use different aliases for the tables. rev2022.12.11.43106. Many of the people who might respond to you will not see old threads. How about if you create a new table with an auto-incrementing id, and then insert all the rows into that in random order? So, for example Update <setle> set <column> = Rand () Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? To store them, your field needs to be VARCHAR(37). how to update random rows in sql Row Number is sql server SQL random boolean sql random decimal Queries related to "t-sql random number for each row" sql get random row select random row sql get random row in sql sql generate random number each row sql generate random number for each row how to select random row in sql sql server get random row Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. 2022 ITCodar.com. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Note that checksum(newid()) can produce -2,147,483,648 and cause integer overflow on abs(), so we need to use modulo on the checksum return value before converting it to absolute value. That may be happening here. Thank you all for your replies. The following article is on the same topic: http://www.sqlusa.com/bestpractices2005/roulettewheel/, While there is a RAND() function that returns a random number between 0 and 1 that can be manipulated to any other range, it is not effective to update multiple rows with one update statement since it is executed only once per statement, not once per row. Here is an example: Sometimes, this 16 byte unique identifier may not be useful for your situation. SQL Server offers the RAND function to generate a random float number between 0 and 1. a little better as I don't see any reference to a Random (rand whatever they call it) function. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Why does the USA not have a constitutional court? For example, the following returns the same value twice for each row: select random(42), random(42) from table1. Updating multiple rows with random values from another table. How would I do this in a sql2000 DB? 15.00 - RANDOM - Teradata Database Teradata Database SQL Functions, Operators, Expressions, and Predicates Product Teradata Database Release Number 15.00 Content Type Programming Reference Publication ID B035-1145-015K Language English (United States) Last Update 2018-09-24 Preface Audience Supported Software Releases and Operating Systems SYNTAX RAND ( [ seed ] ) seed Is it appropriate to ignore emails from a student asking obvious questions? To learn more, see our tips on writing great answers. You would also need to have a trigger that fills the value of the column on insert. cteTable1 and cteTable2 are the aliases for the CTE's (Common Table Expressions) defined in the WITH clause that are adding the random row-numbering to table1 and table2 respectively. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. This generates a random number between 0 and 9999. update table column with different random numbers. MOSFET is getting very hot at high frequency PWM. Improve this question. But it can be UNIQUE. If you think your question is similar to a previously answered thread, it would Example1: Retrieve Random Rows From Single Column. How could I alter this statement to include 0 (zero) values? Answer #1 100 %. Select TOP 1 *. Every where I searched suggested something like this:UPDATEtable1 SETcolumn1 = (SELECT TOP 1 columnA FROM table2ORDER BY NEWID())However all this does is select a random value from table2 and sets every row in column1/table1 to that single random value where what I want is every row to have a randomly selected value. If you have a question, do not add it to an old thread. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. For example, if you want to display all employees on a table in an application by pages, which each page has ten records. To summarize, the following code generates a random number between 0 and 13 inclusive with a uniform distribution: ABS (CHECKSUM (NewId ())) % 14 To change your range, just change the number at the end of the expression. Our main DB is on sql2000 (I have sql2008RS sp3 on my workstation only). Ensure you have assigned a unique constraint to the field as well. So you can define it as random_num int null unique. So, for example. This will do what you want: but if for some reason you really do want a subquery, you just need to make sure that it's dependent upon the rows in the table being updated. 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