EXISTS Is Faster in Performance than IN. If Most of the filter criteria is in subquery then better to use IN and If most of the filter criteria ... ... <看更多>

How does SQL Server know which rows to delete? To understand how it's processed, it's probably more helpful to look at the execution plan ... ... <看更多>

EXISTS is a logical operator that checks if a subquery returns any rows. EXISTS works only with SELECT statements inside the subquery. Let's see ... ... <看更多>