Question

我在SP下方，想要query 3 query 2 = 0 or的值并且想要返回null

的值时，请执行query 1 and query 2/query 3

当我执行SP时，我在@val1 = 50中有一个值，但它仍在if loop内，我只想返回@val，@val1但我是获得5个值

exec usp_GetDefaultValue 'HQP','home','ConDefault','12345'

结果：

HQP：0 //查询1 HQP：50 //查询2 @val：0 @ val1：0任何人都可以帮助我

ALTER PROCEDURE [dbo].[usp_GetDefaultValue]

    @Service varchar(20), @LOB varchar(10), @Scenario varchar(20), @Num varchar(10)

AS
BEGIN

    SET NOCOUNT ON;
    DECLARE @val as int
    DECLARE @val1 as int
    DECLARE    @Value  AS NVARCHAR(MAX)
    DECLARE    @DefValue  AS NVARCHAR(MAX)

    set @Value =  'SELECT '  + @Service + ' from PDetail where LOB = ''' + @LOB  + ''' and Scenario =  ''' + @Scenario + '''  and Number = ''' + @Num + ''' '  -- query 1
    set @DefValue =  'SELECT '  + @Service + ' from PDetail where LOB = ''' + @LOB  + ''' and Scenario =  ''none''  and Number =''none''  and pid = 1'         -- query 2

    exec @val = sp_executesql @Value
    exec @val1 = sp_executesql @DefValue

    if (@val1 = 0 or @val1 = null)  
        begin
            set @DefValue = null
            set @DefValue =  'SELECT '  + @Service + ' from PDetail where LOB = ''' + @LOB  + ''' and Scenario =  ''none''  and pid = 2'               -- query 3
            exec @val1 = sp_executesql @DefValue
        end

    select @val,@val1  -- want to return only two values

END

Answer 1

我建议你改变

  if (@val1 = 0 or @val1 = null)

到

  if (@val1 IS NULL or @val1 = 0)

请记住，这是SQL，检查null的正确方法是使用IS NULL

如何根据动态查询结果的值执行动态查询

1 个答案: