CREATE PROCEDURE "dbo"."TEST_PRC"(
                                            @no_in VARCHAR(20)
                                            ) AS
    BEGIN
        SELECT
            *
        FROM
            TBLTEST tce
        WHERE
            1=1
        AND (
                [email protected]
 
_in
            OR  @no_in IS NULL
            OR  @no_in='')
        
    END

如果傳入引數@no_in為空或者為空的字串，則tce.no這個and條件不加入條件篩選。