There’s a better way than creating endless temporary tables, though.
This article explains how to update a table while selecting from it in a subquery.
Suppose I want to update a table with data from a subquery that refers to the same table.
I might want to do this for a variety of reasons, such as trying to populate a table with its own aggregate data (this would require assignment from a grouped subquery), updating one row from another row’s data without using non-standard syntax, and so on.
UPDATE match Session Members msm JOIN match Sessions ms ON msm.match No = ms.match No AND ms.
) But if its spending time locating the rows to update, I thought that an index might help.
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