为什么这个能够工作...
DECLARE @MyInt int = 12345;
SELECT * FROM MyTable WHERE MyId = @MyInt; --Returns 1 row
SELECT * FROM MyTable WHERE MyId = 12345; --Returns 1 row
但是这个不行吗?DECLARE @MyVarchar varchar = 'ABCDEF';
SELECT * FROM MyTable WHERE MyId = @MyVarchar; --Returns 0 rows
SELECT * FROM MyTable WHERE MyId = 'ABCDEF'; --Returns 1 row
SQL Server的版本是10.50.1746