Start Updating reference tables

Updating reference tables

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.

(Bug #11758262, Bug #50439) See Section, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.

If you access a column from the table to be updated in an expression, assignments are generally evaluated from left to right.

If UPDATE gives an error like this:"You are using safe update mode and you tried to update a table without.." may be that your file must be edited to disable safemode. In order for the change in the file to take effect, you must have permission to restart mysqld in the server OS environment.

There is a page in the online documentation that explains safe mode entitled 'safe Server Startup Script'.

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.

If you wish to use an increment based on subset of a table you may combine UPDATE with Variables:e.g.