Created
April 15, 2014 19:11
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Update Random Rows in a Table based on a Join Condition (PostgreSQL)
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| UPDATE table1 SET table1.col1 = 'some value' WHERE id IN (SELECT table1.id FROM table1, table2 WHERE table1.table2_id = table2.id and table2.colm2 = <some value> ORDER BY RANDOM() LIMIT 20 |
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For mysql change RANDOM() to RAND().