If you use a various-table UPDATE assertion involving InnoDB tables for which you will find overseas crucial constraints, the MySQL optimizer may well process tables in an get that differs from that of their guardian/boy or girl romantic relationship.The second assignment in the subsequent statement sets col2 to The existing (up to date) col1 value, not the original col1 value. The end result is col1 and col2 hold the exact benefit. This habits differs from conventional SQL.
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One-table UPDATE assignments are normally evaluated from still left to appropriate. For a number of-desk updates, there isn't a ensure that assignments are carried out in almost any distinct purchase.
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The 2nd assignment in the next statement sets col2 to The existing (up-to-date) col1 worth, not the first col1 price. The result is col1 and col2 possess the exact same benefit. This behavior differs from standard SQL.
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