Question

我需要在存储过程中使用某些逻辑。所有存储过程都会执行一些逻辑规则，然后根据结果返回true或false。

伪SQL代码：

CREATE TABLE #PV ([Date] DATETIME, Dis FLOAT, Del Float, Sold Float)
INSERT #PV exec GetPVSummaryReport @ID, @PID, @From, @To
SELECT AVG(Dis) / 8 AS DisAvg, AVG(Del) AS DelAvg FROM #PV
IF DisAvg > 20 -- this is the bit I am having problems grokking
    RETURN TRUE
ELSE
    -- do longer calculation

你如何做这种逻辑？

关于代码的注释：表#PV有4个字段 - 提供的字段（日期，Dis，Del和Sold）。

Answer 1

declare @DisAvg float
declare @DelAvg float

-- Instantiate #PV etc

select
  @DisAvg = avg(Dis) / 8,
  @DelAvg = avg(Del)
from
  #PV

if @DisAvg > 20
  return
else
  -- Do something else

Answer 2

为什么每个人都在制作临时表？变量表非常好（and more performant）：）

让我们看看......

DECLARE @PV TABLE ([Date] DATETIME,
    Dis FLOAT,
    Del FLOAT,
    Sold FLOAT)

INSERT INTO @PV
EXEC [dbo].[GetPVSummaryReport] @ID, @PID, @From, @To


-- Create some variables, which will contain the results.
DECLARE @DisAvg AS FLOAT,
    @DelAvg AS FLOAT

-- Retrieve results into a variables.
SELECT @DisAvg = AVG(Dis) / 8, @DelAvg AVG(Del)
FROM @PV

-- Check results...    
IF @DisAvg > 20 
   RETURN TRUE
ELSE BEGIN
    -- do longer calculation
END

-- NOTE: I'm not sure where you use @DelAvg .. 
--       I'm assuming it's in the 'do longer calculation' section.

祝你好运！

Answer 3

LABELS 是一件美丽的事情。 LABELS 允许您使用 GOTO ，这使您可以在存储过程中编写简单的逻辑跟踪。


DECLARE @Result int
SET @Result = 1 -- 1=True 0=False

IF TEST1 Failed
BEGIN
  SET @Result = 0
  GOTO ENDPROCESSING
END

IF TEST2 Failed
BEGIN
  SET @Result = 0
  GOTO ENDPROCESSING
END
IF TEST3 Failed
BEGIN
  SET @Result = 0
  GOTO ENDPROCESSING
END

ENDPROCESSING:
SELECT @Result

Answer 4

您需要声明一个变量并选择它

DECLARE @DisAvg DOUBLE, @DelAvg DOUBLE
SELECT @DisAvg = AVG(Dis) / 8, @DelAvg = AVG(Del) #PV
IF @DisAvg > 20 -- this is the bit I am having problems grokking
    RETURN 1
ELSE
    -- do longer calculation

使用正确的Dis字段类型声明。

修改 - 更正了返回值。

Answer 5

DECLARE @DisAvg DECIMAL
DECLARE @ReturnValue bit

//使用SET或SELECT将值赋给@DisAvg

IF (@DisAvg > 20)
BEGIN 
    SET  @ReturnValue = 1
END
ELSE
BEGIN

    -- do longer calculation
SET @ReturnValue = 0
END 
SELECT @ReturnValue

只能从RETURN语句返回整数，您可以使用SELECT代替

存储过程中的逻辑

5 个答案: