我有一个带参数的存储过程。@PolicySymbol
,它可以接受多个值。为此,我使用了一个拆分字符串函数。StringOfStringsToTable
如果用户选择 @ControlNo
那么我想把这个数据 controlNo
无论为 @PolicySymbol
.
如果 @PolicySymbol
= NULL 我想把所有的数据带到 controlNo
无论它与什么政策符号有关。
下面是代码示例。
CREATE TABLE #Test (ControlNo int, policy_symbol varchar(50))
INSERT INTO #Test
VALUES (1111, 'CSE'), (2222, 'PRE'), (3333, 'CSE'), (4444, 'GLG'),
(4444, 'PRE'), (4444, 'GLS')
DECLARE
@ControlNo int = 1111,
@PolicySymbol varchar(50) = NULL
SELECT DISTINCT ControlNo, policy_symbol
FROM #Test
WHERE ControlNo = COALESCE(@ControlNo, ControlNo)
-- here, if parameter @PolicySymbol IS NULL I want to include all policy symbols
AND policy_symbol IN (SELECT String FROM [dbo].[StringOfStringsToTable] (@PolicySymbol, ','))
DROP TABLE #Test
一个简单的,有逻辑的 OR
确实如此。
WHERE ControlNo = COALESCE(@ControlNo, ControlNo)
-- If parameter @PolicySymbol IS NULL I want to include all policy symbols
AND (
@PolicySymbol IS NULL
OR policy_symbol IN (SELECT String FROM [dbo].[StringOfStringsToTable] (@PolicySymbol,','))
)