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If the first event completes before the second event then I would like to link them up. If you don't have inner join, the left join means that all of table A records will be updated! You can also perform the checks, then pull the data into the temp table(s) and then run the update using the above syntax replacing your table and column names. = total AND vat_percentage = 12) src SET dest.price = src.witoutvat, dest.amount = src.witoutvat WHERE col_tobefixed = 1 AND dest.`receipt_id` = src.receipt_id ; I found this question in looking for my own solution to a very complex join.What I have so far is: @Cerin yea that happened to me. This is an alternative solution, to a more complex version of the problem, which I thought might be useful.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.So, I do it in one "magick" query ;)Here an example:"3" is a some value, from form or somethingupdate item set rate = case when round((rate 3)/2) You sometimes run into the problem that you want to replace a substring occuring in a column with a different string, without touching the rest of the string.The solution is surprisingly simple, thanks to My SQL: UPDATE xoops_bb_posts_text SET post_text=( REPLACE (post_text, '', ' the string function REPLACE, all items in the post_text column with '' get this substring replaced by 'Ideal when writing a script is just too much effort.This option takes a list of one or more partitions or subpartitions (or both).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.

[I have posted this in the Flow Control Functions page last year but I still see people asking how to update multiple rows.

If IGNORE is provided, all errors encountered during the update are ignored.

If an update on a row would result in a violation of a primary key or unique index, the update on that row is not performed.

This will use the SQL UPDATE command with the WHERE clause to update the selected data in the My SQL table tutorials_tbl.

The following example will update the tutorial_title field for a record having the tutorial_id as 3.