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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.
User-defined Function Benefits. The benefits of using user-defined functions in SQL Server are: They allow modular programming. You can create the function once, store it in the database, and call it any number of times in your program. User-defined functions can be modified independently of the program source code.