where not exists sql server?

Where exists and where not exists in SQL?
For example, EXISTS returns true if the subquery returns any rows, and [ NOT ] EXISTS returns true if the subquery returns no rows. The EXISTS condition is considered to be met if the subquery returns at least one row.
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Where exists in SQL Server?
The EXISTS operator is a logical operator that allows you to check whether a subquery returns any row. The EXISTS operator returns TRUE if the subquery returns one or more rows. In this syntax, the subquery is a SELECT statement only.
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Where not exists in SQL Server?
The SQL NOT EXISTS Operator will act quite opposite to EXISTS Operator. It is used to restrict the number of rows returned by the SELECT Statement. The NOT EXISTS in SQL Server will check the Subquery for rows existence, and if there are no rows then it will return TRUE, otherwise FALSE.
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Where Not Exists vs where not in?
The most important thing to note about NOT EXISTS and NOT IN is that, unlike EXISTS and IN, they are not equivalent in all cases. Specifically, when NULLs are involved they will return different results. To be totally specific, when the subquery returns even one null, NOT IN will not match any rows. Feb 18, 2010
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