在 Pivot 中执行操作

Question

我正在尝试实现 PIVOT，但我无法在其中执行基本操作。

当前 table:

week_no  username  days      pick_count duration
------------------------------------------------
Week 50  Beck W    Wednesday 227        7978
Week 50  Beck W    Friday    320        7481
Week 50  Beck W    Friday    282        5718
Week 50  Cockram D Thursday  165        10478
Week 50  Cowell P  Thursday  145        14403
Week 50  Cowell P  Thursday  159        7450
Week 50  Cowell P  Friday    217        13101
...

预期结果：

week_no username  monday tuesday wednesday thursday friday saturday sunday
--------------------------------------------------------------------------
Week 50 Beck W    NULL   NULL    102       NULL     164    NULL     NULL
Week 50 Cockram D NULL   NULL    NULL      56       NULL   NULL     NULL
Week 50 Cowell P  NULL   NULL    NULL      50       59     NULL     NULL
...

预期结果应计算如下：pick_count * 3600 / duration。那是我在计算时遇到问题的计算。当PIVOT像这样时

SELECT 
    *
FROM 
(
    SELECT 
        week_no,
        username,
        days,
        pick_count,
        duration
    FROM
        table
) AS src
PIVOT 
(
    SUM(pick_count) * 3600 / SUM(duration) FOR days IN (monday, tuesday, wednesday, thursday, friday, saturday, sunday)
) AS pvt

我得到 Incorrect syntax near '*'。

Answer 1

PIVOT不是很灵活。

您可以只使用旧式交叉表方法。

SELECT week_no,
       username,
       SUM(CASE WHEN days = 'monday' then pick_count end) * 3600 
                    / SUM(CASE WHEN days = 'monday' then duration end) as monday,
       SUM(CASE WHEN days = 'tuesday' then pick_count end) * 3600 
                    / SUM(CASE WHEN days = 'tuesday' then duration end) as tuesday
/*TODO: Add other five days*/
FROM   YourTable
GROUP  BY week_no,
          username

Answer 2

我终于找到了我要找的东西。事实上，我需要做的就是计算 SELECT 而不是 PIVOT.

中的计算

SELECT 
    *
FROM 
(
    SELECT 
        week_no,
        username,
        days,
        SUM(pick_count) * 3600 / SUM(duration) AS pick_rate
    FROM
        table
    GROUP BY
        week_no,
        username,
        days
) AS src
PIVOT 
(
    MAX(pick_rate) FOR days IN (monday, tuesday, wednesday, thursday, friday, saturday, sunday)
) AS pvt

在 Pivot 中执行操作

Performing operations in a Pivot

sql-server

pivot

syntax-error