sql-server - 当我在存储过程中更改它时，带有空值的参数不会改变

Question

我有一个如下所示的存储过程；当我通过时NULL，Gkol我希望将其更改为尽可能少的数量（存在于表中），但它没有发生 - 为什么会这样？

ALTER PROCEDURE sp_vUnitsUnitTejariGetFilteredUnitDetail
    (@UnitFB BIT,
     @UnitWithCooking BIT,
     @MMofidFrom FLOAT = NULL,
     @MMofidTo FLOAT = NULL,
     @GKolFrom FLOAT = NULL,
     @GKolTo FLOAT = NULL)
AS
BEGIN
    DECLARE @MMofidCalculative BIT
    DECLARE @GKolCalculative BIT

    IF (@MMofidFrom IS NULL)
        SELECT @MMofidFrom = MIN(MMofid) 
        FROM vw_PSA_UnitsUnitTejari

    IF (@MMofidTo IS NULL)
        SELECT @MMofidTo = MAX(MMofid) 
        FROM vw_PSA_UnitsUnitTejari

    IF (@GKolFrom IS NULL)
        SELECT @GKolFrom = MIN(GKol) 
        FROM vw_PSA_UnitsUnitTejari

    IF (@GKolTo IS NOT NULL)
        SELECT @GKolTo = MAX(GKol) 
        FROM vw_PSA_UnitsUnitTejari

    SELECT * 
    FROM vw_PSA_UnitsUnitTejari 
    WHERE UnitTypeID = 1
      AND UnitStateID = 1
      AND UnitFB = ISNULL(@UnitFB, UnitFB)
      AND UnitWithCooking = ISNULL(@UnitWithCooking, UnitWithCooking)
      AND MMofid BETWEEN @MMofidFrom AND @MMofidTo
      AND GKol BETWEEN @GKolFrom AND @GKolTo
END

Answer 1

我弄清楚为什么它不起作用，问题出在最后一个 if 块

if(@GKolTo is not null)

我删除了NOT，一切顺利，谢谢大家