Updating multiple rows in mysql
Only the partitions (or subpartitions) listed are checked for matches, and a row that is not in any of these partitions or subpartitions is not updated, whether it satisfies the clause, are flagged as unsafe for statement-based replication.(This is because the order in which the rows are updated determines which rows are ignored.) Such statements produce a warning in the error log when using statement-based mode and are written to the binary log using the row-based format when using mode.
If you do not use it, all rows that are outside the range of your updated values will be set to blank!I was not able, using my SQL 4.1.1, to do this as a subquery: UPDATE Groups LEFT JOIN (SELECT Group Id, MIN(Val Within Group) AS base Val FROM Groups GROUP BY Group Id) AS Grp Sum USING (Group Id) SET Val Within Group=Val Within Group-base Val; Csaba Gabor UPDATE Syntax with "on-line" updating value limitations.I had a problem - a had to update a column "rate" but if the existince or new value is greater then 5 this "5" will be finally value in field.His example was:update t1,t2 set t1.field=t2.value where t1.this=t2.that; That strikes me as an elegant syntax.Here is the closest I could come up with for doing that on Oracle:update t1 set t1.field=(select value from t2 where t1.this=t2.that) where t1in (select that from t2); That strikes me as convoluted by comparison.