这是我的数据表tbl_counter
refId refMid dateTimeStmp volCtr1 volCtr2 volCtr3 volCtr4
----------- ----------- ----------------------- ----------- ----------- ----------- -----------
3 DEVICE1 2014-03-01 00:00:00.000 100 200 300 400
4 DEVICE1 2014-03-02 00:00:00.000 100 200 300 400
5 DEVICE1 2014-03-03 00:00:00.000 100 200 300 400
6 DEVICE2 2014-03-02 00:00:00.000 100 200 300 400
7 DEVICE2 2014-03-03 00:00:00.000 100 200 300 400
8 DEVICE3 2014-03-03 00:00:00.000 100 200 300 400
9 DEVICE3 2014-03-01 00:00:00.000 100 200 300 400
10 DEVICE5 2014-03-01 00:00:00.000 100 200 300 400
11 DEVICE5 2014-03-02 00:00:00.000 100 200 300 400
12 DEVICE5 2014-03-03 00:00:00.000 100 200 300 400
13 DEVICE5 2014-03-04 00:00:00.000 100 200 300 400
14 DEVICE6 2014-03-04 00:00:00.000 100 200 300 400
15 DEVICE7 2014-03-02 00:00:00.000 100 200 300 400
16 DEVICE8 2014-03-01 00:00:00.000 100 200 300 400
17 DEVICE8 2014-03-02 00:00:00.000 100 200 300 400
18 DEVICE8 2014-03-03 00:00:00.000 100 200 300 400
19 DEVICE8 2014-03-04 00:00:00.000 100 200 300 400
我需要的是数据采用以下格式
DATE DEVICE1 DEVICE2 DEVICE3 DEVICE4 DEVICE5 DEVICE6 DEVICE7 DEVICE8
01-03-2014 1000 1000 1000 1000
02-03-2014 1000 1000 1000 1000 1000
03-03-2014 1000 1000 1000 1000 1000
04-03-2014 1000 1000 1000
（结果表DEVICE * n colomn包含volCtr1 + volCtr2 + volCtr3 + volCtr4） 这可以通过为每个DEVICE创建临时表并使用连接来完成，但我需要更好的方法（如果有的话）。
答案 0 :(得分：1)
试试这个：
SELECT dateTimeStmp, DEVICE1, DEVICE2, DEVICE3, DEVICE4, DEVICE5, DEVICE6, DEVICE7, DEVICE8
FROM (SELECT CONVERT(DATE, c.dateTimeStmp) AS dateTimeStmp,
('DEVICE' + CONVERT(VARCHAR(100), c.refMid)) AS ColHeader,
(c.volCtr1 + c.volCtr2 + c.volCtr3) DEVICEDATA
FROM tbl_counter c
) AS A
PIVOT(SUM(DEVICEDATA) FOR ColHeader IN (DEVICE1, DEVICE2, DEVICE3, DEVICE4, DEVICE5, DEVICE6, DEVICE7, DEVICE8)) AS P
或
SELECT CONVERT(DATE, c.dateTimeStmp) AS Date,
SUM(CASE WHEN c.refMid = 1 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE1,
SUM(CASE WHEN c.refMid = 2 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE2,
SUM(CASE WHEN c.refMid = 3 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE3,
SUM(CASE WHEN c.refMid = 4 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE4,
SUM(CASE WHEN c.refMid = 5 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE5,
SUM(CASE WHEN c.refMid = 6 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE6,
SUM(CASE WHEN c.refMid = 7 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE7,
SUM(CASE WHEN c.refMid = 8 THEN c.volCtr1 + c.volCtr2 + c.volCtr3 ELSE 0 END) AS DEVICE8
FROM tbl_counter c
GROUP BY CONVERT(DATE, c.dateTimeStmp);