Question

是否可以通过列别名之一对PagedTable的结果进行排序？

这是我的工作查询：

SELECT * FROM 
( 
SELECT 
DI.P_ID as IDEA_ID, 
DI.P_IDEA_NUMBER as IDEA_NUMBER, 
CASE WHEN len(DI.P_TITLE) < 1 then 'None recorded' else DI.P_TITLE END as IDEA_TITLE, 
CASE WHEN len(DI.P_IDEA_MANAGER) < 1 then 'None' ELSE isnull((Select top 1 FName+' 'LName from OTHERSERVER.OTHERDB.dbo.Usernames as UN1 where (XID=DI.P_IDEA_MANAGER) order by endDate desc),'No longer on record') end as IDEA_MANAGER, 
CASE WHEN len(DI.P_RELEASE_MONTH) < 1 or len(DI.P_RELEASE_YEAR) < 1 then 'None recorded' else DI.P_RELEASE_MONTH+'/'+DI.P_RELEASE_YEAR END as IDEA_REQUESTED_RELEASE, 
SIS.LABEL as IDEA_STATUS, 
ROW_NUMBER() OVER(Order by DI.P_IDEA_NUMBER ASC) as RowNum 
FROM 
DATA_IDEA as DI 
LEFT OUTER JOIN 
SEL_IDEA_STATUS as SIS on SIS.ID=(SELECT TOP 1 S_ID from DATA_IDEA_STATUS as DIS where (DIS.P_ID=DI.P_ID) order by created desc) 
WHERE 
(SIS.IS_DRAFT='True')
) 
as PagedTable where (RowNum between 1 and 10)

有了这个，我按“想法编号”排序结果，即1,2,3等。而不是按“DI.P_IDEA_NUMBER”排序，是否可以通过“IDEA_NUMBER”排序？

你可能认为这不是一个很大的交易，按想法编号排序。好吧，我还必须通过“IDEA_MANAGER”对结果进行排序。根据案例statemnt，IDEA_MANAGER将是三件事之一。 1）John Smith，2）没有记录，3）不再记录

Answer 1

＆＃34;是否可以通过其中一列别名对PagedTable的结果进行排序？＆＃34;

你尝试过吗？

这应该有效：

SELECT Col1 AS MyAlias 
  FROM tbl 
 ORDER BY MyAlias

这也应该有效：

SELECT * 
  FROM (SELECT Col1 AS MyAlias FROM tbl) a
 ORDER BY MyAlias

但它可能取决于你的RDBMS。

借鉴How do i use alias in where clause?：

column_alias可以在ORDER BY子句中使用，但不能使用它在WHERE，GROUP BY或HAVING子句中。

Taken from the MSSQL Doc

此外，您不能将其用作OVER子句。

cannot use alias in ROW_NUMBER() over in SQL Server?

按列别名对PagedTable进行排序

1 个答案: