MySQL 聚合查询未按预期运行

Question

我正在尝试汇总一些通话记录并做错了事 - 但不确定是什么。

我有以下查询:

SELECT 
    c.name, 
    IF(MONTH(start) = 1, SUM(duration),0) AS 'Jan',
    IF(MONTH(start) = 2, SUM(duration),0) AS 'Feb',
    IF(MONTH(start) = 3, SUM(duration),0) AS 'Mar',
    IF(MONTH(start) = 4, SUM(duration),0) AS 'Apr',
    IF(MONTH(start) = 5, SUM(duration),0) AS 'Jun',
    IF(MONTH(start) = 6, SUM(duration),0) AS 'Jul',
    IF(MONTH(start) = 7, SUM(duration),0) AS 'Aug'
FROM
    call_history ch, client c
WHERE
    ch.client_reseller_id = c.id
GROUP BY ch.client_reseller_id
ORDER BY c.name;

start 字段包含调用的日期/时间。该表只包含一年的记录，所以不用担心没有过滤年份。

我得到的结果不符合预期:

+--------------------------------+----------+------+------+--------+------+------+------+
| name                           | Jan      | Feb  | Mar  | Apr    | Jun  | Jul  | Aug  |      
|+-------------------------------+----------+------+------+--------+------+------+------+
| Come company                   |  5243080 |    0 |    0 |      0 |    0 |    0 |    0 |
| Other cust                     |  4085085 |    0 |    0 |      0 |    0 |    0 |    0 |
| Someone                        |  1449543 |    0 |    0 |      0 |    0 |    0 |    0 |
| Demo Reseller                  |     2342 |    0 |    0 |      0 |    0 |    0 |    0 |
+--------------------------------+----------+------+------+--------+------+------+------+

我做错了什么？

Answer 1

这样改

SELECT 
    c.name, 
   SUM(IF(MONTH(start) = 1, duration,0)) AS 'Jan',
    SUM(IF(MONTH(start) = 2, duration,0)) AS 'Feb',
    SUM(IF(MONTH(start) = 3, duration,0)) AS 'Mar',
    SUM(IF(MONTH(start) = 4, duration,0)) AS 'Apr',
    SUM(IF(MONTH(start) = 5, duration,0)) AS 'Jun',
    SUM(IF(MONTH(start) = 6, duration,0)) AS 'Jul',
    SUM(IF(MONTH(start) = 7, duration,0)) AS 'Aug'
FROM
    call_history ch, client c
WHERE
    ch.client_reseller_id = c.id
GROUP BY ch.client_reseller_id
ORDER BY c.name;