Question

我有一个问题要问：

Time     Pass    Fail
-------------------------
08:30    10       2
09:30    12       1
10:30    20       0
11:30    30       40

我正在尝试将行转换为列并在下面显示此类信息

08:30    09:30   10:30   11:30
------------------------------
 10        12      20      30
  2         1       0      40

请帮助我！

谢谢！

Answer 1

这应该可以解决问题......

IF OBJECT_ID('tempdb..#TestData', 'U') IS NOT NULL 
DROP TABLE #TestData;

CREATE TABLE #TestData (
    [Time] DATETIME NOT NULL,
    Pass INT NOT NULL,
    Fail INT NOT null
    );
INSERT #TestData (Time, Pass, Fail) VALUES 
    ('08:30',10, 2),
    ('09:30',12, 1),
    ('10:30',20, 0),
    ('11:30',30, 40);

SELECT 
    [P/F] = CASE WHEN pf.id = 1 THEN 'Pass' ELSE 'Fail' END,
    [08:30] = MAX(CASE WHEN td.[Time] = '08:30' THEN pf.Value END),
    [09:30] = MAX(CASE WHEN td.[Time] = '09:30' THEN pf.Value END),
    [10:30] = MAX(CASE WHEN td.[Time] = '10:30' THEN pf.Value END),
    [11:30] = MAX(CASE WHEN td.[Time] = '11:30' THEN pf.Value END)
FROM
    #TestData td
    CROSS APPLY ( VALUES (1, td.Pass), (2, td.Fail) ) pf (id, Value)
GROUP BY
    pf.id;

结果...

P/F  08:30       09:30       10:30       11:30
---- ----------- ----------- ----------- -----------
Pass 10          12          20          30
Fail 2           1           0           40

将行转换为Sql查询中的列到时间列

1 个答案: