Tsql T-SQL,SQL Server Compact Edition,用于选择的别名
如何优化我的SQL代码 我想添加别名 我使用的是SQL Server Compact Edition (…)是一个Tsql T-SQL,SQL Server Compact Edition,用于选择的别名,tsql,select,sql-server-ce,alias,Tsql,Select,Sql Server Ce,Alias,如何优化我的SQL代码 我想添加别名 我使用的是SQL Server Compact Edition (…)是一个SELECT查询 SELECT * FROM ( ... ) WHERE id IN ( SELECT id FROM ( ... ) GROUP BY id HAVING COUNT( * ) > 1 ) 我
SELECT
查询
SELECT
*
FROM ( ... )
WHERE
id IN
(
SELECT
id
FROM ( ... )
GROUP BY
id
HAVING
COUNT( * ) > 1
)
我建议只使用该查询一次。您可以创建该查询的CTE,然后按如下方式编写查询:
with cte
As
(....)
Select *
from cte
where id in
(select id from cte
group by id
having count(*) > 1)
希望有帮助这是另一个选择:
SELECT * FROM
(SELECT *, COUNT(*) OVER(PARTITION BY id) ids FROM (...)) x
WHERE ids>1
(…)中的两个查询是否相同?