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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.
To avoid an InvalidOperationException, user-defined functions in LINQ to SQL must be in one of the following forms: A function wrapped as a method call having the correct mapping attributes. For more information, see Attribute-Based Mapping. A static SQL method specific to LINQ to SQL. A function supported by a .NET Framework method.