1

我有一张这样的数据表。

Id       PId         Device             Status          Type      Created_Date
===      ===         ======             ======          ====      ============
1         2           1                  today          High      2012-04-12 08:11:51.583
2         2           4                  today          Medium    2012-04-02 01:39:52.393
3         3           5                  today          Medium    2012-04-02 01:10:02.443
4         2           6                  today          High      2012-04-02 01:05:25.063
5         2           3                  today          High      2012-04-02 01:03:08.360
6         2           7                  today          High      2012-04-02 01:02:57.093
7         2           2                  today          High      2012-04-02 00:22:37.807

现在，我希望设备 6 和 7 的记录始终位于记录集的顶部，并按创建日期的降序排列。并且记录除 6 和 7 以外的设备，按类型和创建日期在设备类型 6 和 7 的记录之后降序排列。

所以想要的结果如下：

Id       PId         Device             Status          Type      Created_Date
===      ===         ======             ======          ====      ============
4         2           6                  today          High      2012-04-02 01:05:25.063
6         2           7                  today          High      2012-04-02 01:02:57.093
1         2           1                  today          High      2012-04-12 08:11:51.583
5         2           3                  today          High      2012-04-02 01:03:08.360
7         2           2                  today          High      2012-04-02 00:22:37.807
2         2           4                  today          Medium    2012-04-02 01:39:52.393

我使用了如下查询：

select * from TblAlert where PId=2 and ( Device=6 OR Device=7) and ( Status='Today' or Status=0)
UNION
Select * from TblAlert Where  PId=2 and ( Device<>6 OR Device<>7)and (Status='Today' or Status=0)
order by Type,Created_Date desc

但它不起作用，因为它在整个记录集上应用 order by 子句。

有人可以帮我解决这个问题吗？

4

2 回答 2

4 
select *
from TblAlert 
where PId=2 and ([Status]='Today' or [Status]='0')
order by case when Device in (6, 7) then 0 else 1 end,
         case when Device in (6, 7) then [Type] else '' end,
         Created_Date
于 2012-04-23T05:17:45.150 回答
0

通过使用表变量作为我自己解决了这个问题

DECLARE @Records TABLE
(
   Id  int,
   PId int,
   Device int,
   Status Alert_Type varchar(10),
   Type Alert_Type varchar(5), 
   Created_Date DateTime
); 

INSERT @Records 
    SELECT Id, PId, Device, Status,Type,Created_Date FROM 
        TblAlert 
    WHERE 
        PId =2
        AND Device IN (6,7) 
        AND ( Status='Today' or Status=0) 
    ORDER BY 
        Created_Date DESC; 

INSERT @Records 
    SELECT Id, PId, Device, Status,Type,Created_Date FROM 
        TblAlert 
    WHERE 
        PId =2
        AND Device NOT IN (6,7) 
        AND ( Status='Today' or Status=0) 
    ORDER BY 
        Type, Created_Date DESC; 

SELECT * FROM @Records;
于 2012-05-09T12:39:13.913 回答