INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Microsoft SQL Server: Programming FAQ

## Random Numbers

 How to SELECT *, RandomNumber AS Rnd by fhlee faq183-7147 Posted: 9 Mar 09 Just a quickie Random Number solution. If anyone tried this before:  SELECT *, RAND() FROM myTable;you will be surprised that the random number is all the same/identical.There are ways around it, depending on what you want to do.1. If you just want the random number for the purpose of sorting, then this will do nicely:  SELECT TOP 5 * FROM myTable ORDER BY NEWID();2. If you need an INT random number for each row, then try this:  SELECT *, CHECKSUM(NEWID()) AS rnd FROM myTable;  *Note: The random number will range from -2,147,483,648 to 2,147,483,647. If you do not want the negative number, ABS() it.3. If you need a FLOAT random number >0 and <=1 (the normal random number). This MAY be useful, although I think there is a more performance friendly way.  SELECT *, ABS(CONVERT( INT, CONVERT( BINARY(4), NEWID() ) ) / 2147483647.0) AS rnd FROM myTable;     -OR-  SELECT *, ABS( CHECKSUM(NEWID()) / 2147483647.0) AS rnd FROM myTable;  *Note: I have not determine for sure which is more efficient, but guts feeling tells me the data-type CONVERSION should be faster than the CHECKSUM function.  Hope these quickies help someone. have a nice day. Back to Microsoft SQL Server: Programming FAQ Index Back to Microsoft SQL Server: Programming Forum

Close Box

# Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!