有沒有更好的方法來完成這個SQL查詢？

Question

DECLARE @MinPV MONEY   -- PSV 
DECLARE @MaxPV MONEY   -- PSV 
DECLARE @MinGV MONEY   -- GV 
DECLARE @MaxGV MONEY   -- GV 
DECLARE @MinLBV MONEY   -- LBV 
DECLARE @MaxLBV MONEY   -- LBV 
DECLARE @MinRBV MONEY   -- RBV 
DECLARE @MaxRBV MONEY   -- RBV 
SET @MinPV = 5     -- PSV 
SET @MaxPV = 0     -- PSV 
SET @MinGV = NULL    -- GV 
SET @MaxGV = NULL    -- GV 
SET @MinLBV = NULL    -- LBV 
SET @MaxLBV = NULL    -- LBV 
SET @MinRBV = NULL    -- RBV 
SET @MaxRBV = NULL    -- RBV 

SELECT psv,* 
FROM Distributordetail 
WHERE 
    (PSV BETWEEN @MinPV AND @MaxPV) OR   -- Both @MinVol and @MaxVol supplied 
    (PSV > @MinPV AND @MaxPV IS NULL) OR  -- Only @MinVol supplied 
    (PSV < @MaxPV AND @MinPV IS NULL) OR  -- Only @MaxVol supplied 

WHERE子句有4行，我需要爲每個可以傳入的參數添加更多的行。誰能告訴我是否有更好的方法呢？

EDITED：

(PSV BETWEEN @MinPV AND @MaxPV) OR   -- Both @MinVol and @MaxVol supplied 
(PSV > @MinPV AND @MaxPV IS NULL) OR  -- Only @MinVol supplied 
(PSV < @MaxPV AND @MinPV IS NULL) OR  -- Only @MaxVol supplied 
(@MinPV IS NULL AND @MaxPV IS NULL)   -- Neither @MinVol and @MaxVol supplied 
(GSV BETWEEN @MinGV AND @MaxGV) OR   -- Both @MinVol and @MaxVol supplied 
(GSV > @MinGV AND @MaxGV IS NULL) OR   -- Only @MinVol supplied 
(GSV < @MaxGV AND @MinGV IS NULL) OR   -- Only @MaxVol supplied 
(@MinGV IS NULL AND @MaxGV IS NULL)   -- Neither @MinVol and @MaxVol supplied 

Answer 1

申報2附加變量來包含min and max values for the MONEY data type，然後這些值替換爲NULL。

編輯：

DECLARE @MoneyMin MONEY 
DECLARE @MoneyMax MONEY 

SET @MoneyMin = -922,337,203,685,477.5808 
SET @MoneyMax = 922,337,203,685,477.5807 

IF (@MinPV IS NOT NULL OR @MaxPV IS NOT NULL) 
    SELECT @MinPV = ISNULL(@MinPV, @MoneyMin), @MaxPV = ISNULL(@MaxPV, @MoneyMax) 

IF (@MinGV IS NOT NULL OR @MaxGV IS NOT NULL) 
    SELECT @MinGV = ISNULL(@MinGV, @MoneyMin), @MaxGV = ISNULL(@MaxGV, @MoneyMax) 

SELECT psv,* 
FROM Distributordetail 
WHERE 
    (PSV BETWEEN @MinPV AND @MaxPV) OR 
    (GSV BETWEEN @MinGV AND @MaxGV)