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Thread: Illegal grouping
Jan 31, 2006, 03:25 #1
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I am having a table with a numeric column where several rows can contain the same value. Now I am trying to determine a random value and then to get a random row from all rows with the next larger value.
Basically I already got it working with the following pseudo code
// Getting a random value between 0 and the maximum value of field value = SELECT ROUND(RAND()*MAX(field)) FROM table // Getting the next larger value based on the random value value2 = SELECT field FROM table WHERE field>value ORDER BY field LIMIT 1 // Getting one random row from all rows with the determined value row = SELECT * FROM table WHERE field=value2 ORDER BY RAND() LIMIT 1
For example by trying to combine the first two calls into
SELECT field FROM table WHERE field>ROUND(RAND()*MAX(field)) ORDER BY field LIMIT 1
Sorry, forgot to mention that this is about a MySQL database and hence probably went better into http://www.sitepoint.com/forums/forumdisplay.php?f=182
Last edited by some1; Jan 31, 2006 at 05:55.