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This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples. Click the Try It button next to an example to test it for yourself in our SQL Editor. The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row.
1 User Defined Functions: Allow you to define your own Transact-SQL functions using the CREATE FUNCTION statement. 2  User Defined Functions use zero or more input parameters, and return a single value. 3  Some User Defined Functions return a single, scalar data value, such as an int, char, or decimal value.