Sql server 结果表达式中的IN语句中的CASE-THEN表达式
是否可以在的情况下使用。然后Sql server 结果表达式中的IN语句中的CASE-THEN表达式,sql-server,tsql,sql,Sql Server,Tsql,Sql,是否可以在的情况下使用。然后 WHERE record.field = CASE WHEN @flag = 1 THEN a WHEN @flag = 2 THEN IN (b, c) END 或者如何重写这种情况?试试: WHERE (@flag = 1 AND record.field = a ) OR (@flag = 2 AND record.field IN (b, c)) 最好尝试加入值并使用索引: D
WHERE
record.field =
CASE
WHEN @flag = 1 THEN a
WHEN @flag = 2 THEN IN (b, c)
END
或者如何重写这种情况?试试:
WHERE (@flag = 1 AND record.field = a )
OR (@flag = 2 AND record.field IN (b, c))
最好尝试加入值并使用索引:
DECLARE @Table (ValueOf int)
INSERT INTO @Table ((ValueOf)
SELECT a WHERE @flag = 1
UNION SELECT b WHERE @flag = 2
UNION SELECT c WHERE @flag = 2
SELECT
....
FROM ... x
INNER JOIN @Table t ON x...=t.ValueOf
对不起,没有:
WHERE
(@flag = 1 AND record.field = a)
OR
(@flag = 2 AND record.field IN (b, c))