Simulating an EXISTS Clause in a Natively Compiled Stored Procedure

Natively compiled stored procedures do not support the EXISTS clause, but there is a workaround:

DECLARE @exists BIT = 0  
SELECT TOP 1 @exists = 1 FROM MyTable WHERE ...  
IF @exists = 1  

See Also

Migration Issues for Natively Compiled Stored Procedures
Transact-SQL Constructs Not Supported by In-Memory OLTP