1

我创建了一个临时表，存储客户详细信息，如果 IsDefault 设置为 1，我想查询按 CustomerNo 分组的数据并显示 ImagePath。

CREATE TABLE #Temp
(ID varchar(100), CustomerNo varchar(10), IsDefault int, ImagePath varchar(100), ViewCount int)

INSERT INTO #Temp
SELECT '1', 'AC1234', 1, 'xxx1.jpg', 12 UNION ALL
SELECT '2', 'AC1234', 0, 'xxx2.jpg', 42 UNION ALL
SELECT '3', 'AC1234', 0, 'xxx3.jpg', 15 UNION ALL
SELECT '4', 'AC1235', 0, 'xxx4.jpg', 16 UNION ALL
SELECT '5', 'AC1236', 1, 'xxx5.jpg', 13 UNION ALL
SELECT '6', 'AC1234', 0, 'xxx6.jpg', 56 UNION ALL
SELECT '7', 'AC1235', 1, 'xxx7.jpg', 17

SELECT * FROM #Temp
SELECT CustomerNo, MAX(IsDefault) as IsDefault, Sum(ViewCount) as ViewCount FROM #Temp
GROUP BY CustomerNo

DROP TABLE #Temp

结果：

CustomerNo IsDefault   ViewCount
---------- ----------- -----------
AC1234     1           125
AC1235     1           33
AC1236     1           13

我可以得到这样的结果吗（如果“IsDefault”= 1，则显示 ImagePath）？

CustomerNo IsDefault   ViewCount   ImagePath
---------- ----------- ----------- -----------
AC1234     1           125         xxx1.jpg
AC1235     1           33          xxx4.jpg
AC1236     1           13          xxx5.jpg

非常感谢！！

4

1 回答 1

0

假设只有一条记录的 IsDefault 标志为 1，这可以解决问题：

CREATE TABLE #Temp (
    ID varchar(100)
  , CustomerNo varchar(10)
  , IsDefault int
  , ImagePath varchar(100)
  , ViewCount int
);

INSERT INTO #Temp
SELECT '1', 'AC1234', 1, 'xxx1.jpg', 12 UNION ALL
SELECT '2', 'AC1234', 0, 'xxx2.jpg', 42 UNION ALL
SELECT '3', 'AC1234', 0, 'xxx3.jpg', 15 UNION ALL
SELECT '4', 'AC1235', 0, 'xxx4.jpg', 16 UNION ALL
SELECT '5', 'AC1236', 1, 'xxx5.jpg', 13 UNION ALL
SELECT '6', 'AC1234', 0, 'xxx6.jpg', 56 UNION ALL
SELECT '7', 'AC1235', 1, 'xxx7.jpg', 17
;

with CustomerReport (CustomerNo, ViewCount) as 
     (SELECT t.CustomerNo, Sum(t.ViewCount) ViewCount 
        FROM #Temp t
       GROUP BY t.CustomerNo)
Select q1.CustomerNo, q1.ViewCount 
       , (Select ImagePath
            from #Temp
           where #Temp.CustomerNo = q1.CustomerNo
             and #Temp.IsDefault = 1) ImgPath
  from CustomerReport q1
;

drop table #temp
;

AFAIK，您需要 MS-SQL 2008+ 才能获得对 CTE 语法的支持。

于 2012-11-21T04:23:10.777 回答