Fastest Way to Check if MYSQL Table Exists in PHP. Dynamic PHP pages give you the option to choose a MySQL table dynamically from which to query. You must ensure that the table exists before ...

Running large, multi-table operations in a single transaction Let’s say you need to delete data from 10 tables as part of some operation.

In MySQL it's about 4 seconds vs. about 1.5 minutes. I believe MySQL is creating a temporary table with the entire contents of the subquery where as SQL Server's optimizer is doing something smarter.