Question

块引用

DECLARE @Symbol nvarchar(50);
DECLARE @EnDate1 Datetime;
DECLARE @StDate1 Datetime;
SET @Symbol = 'RIM12f'
SET @EnDate1 = '05/08/2012 9:00'
SET @StDate1 = '05 / 07 / 2012 12 : 00'
SELECT  *
FROM   Siri
WHERE (DATEADD(D, 0, DATEDIFF(D, 0, Date)) BETWEEN @StDate1 AND @EnDate1)
  AND  CASE Symbol = WHEN @Symbol = 'ALL'
                     THEN Symbol
                     ELSE Symbol LIKE LEFT(@Symbol, len(@Symbol) - 3) + '%'
       END

它不起作用但是它适用于@Symbol 但我需要所有符号，如LEFT（@Symbol，len（@Symbol） - 3）+'％'如果@Symbol除了所有

Answer 1

修改案例表达式：

 Symbol LIKE CASE @Symbol WHEN 'ALL'
                     THEN Symbol
                     ELSE LEFT(@Symbol, len(@Symbol) - 3) + '%'

Answer 2

DECLARE @Symbol nvarchar(50); 
DECLARE @LikeSymbol nvarchar(50); 

DECLARE @EnDate1 Datetime; 
DECLARE @StDate1 Datetime; 
SET @Symbol = 'RIM12f' 
SET @EnDate1 = '05/08/2012 9:00' 
SET @StDate1 = '05 / 07 / 2012 12 : 00' 
SET @LikeSymbol = LEFT(@Symbol, length(@Symbol) - 3) + '%'
SELECT  * 
FROM   Siri 
WHERE (DATEADD(D, 0, DATEDIFF(D, 0, Date)) BETWEEN @StDate1 AND @EnDate1) 
AND (
(@Symbol = 'All')
OR
(Symbol Like @LikeSymbol)
)

猜测您的查询意图远非明确

Answer 3

您不能CASE =和嵌套LIKE ..您可以使用LIKE或使用OR和AND结构...（如建议的那样） @Tony Hopkinson）

以下是修改过的案例：

Symbol like CASE WHEN @Symbol = 'ALL'
                     THEN Symbol
                     ELSE LEFT(@Symbol, len(@Symbol) - 3) + '%'
END

带有case＆amp;的sql where子句喜欢

3 个答案: