Question

我有3张桌子; COMPANY，TRAINING TICKET和TEST。

COMPANY表：

 COMPANY CODE | COMPANY NAME
 192            ABC ENTERPRISE
 299            XYZ ENTERPRISE

TRAINING TICKET表：

 TICKET ID | COMPANY CODE | START DATE
 2900            192           2015-02-02
 3939            192           2015-03-03
 4399            299           2015-03-02

TEST SESSION表：

 TEST CODE | TICKET ID | COMPANY CODE | CERTIFIED
 1221        2900            192            YES
 2821        3939            192            NULL
 3922        4399            299            YES

我需要这样的东西：

 C. CODE | COMPANY NAME | 1ST START DATE | TRAINING TICKET TOTAL | CERTIFIED TOTAL
 192      ABC ENTERPRISE  2015-02-02             2                1
 299      XYZ ENTERPRISE  2015-03-02             1                1

可能吗？

我的Sql指令是：

Select *, count(TICKET.CCODE) AS TICKET_TOTAL, count(TEST.CODE) AS CERT_TOTAL
from TICKET 
Inner Join COMPANY on TICKET.CCODE = COMPANY.CCODE 
Inner Join TEST on COMPANY.CCODE = TEST.CCODE 
Group by (TICKET.CCODE),(TEST.CCODE)
Order by TICKET_TOTAL DESC

但两个计数总是等于（TICKET_TOTAL和CERT_TOTAL的结果相同）且总和是错误的 - 结果是TICKET_TOTAL = 21和CERT_TOTAL = 28，但我得到了523 - 对于TOP 1公司。

Answer 1

我得到了答案：

Select COMPANY.CODE, COMPANY.NAME, 
MIN(TICKET.STARTDATE), count(TICKET.TICKETID) AS TICKET_TOTAL, 
count(TEST.CERTIFIED) AS CERT_TOTAL
    from COMPANY
    INNER JOIN TICKET ON COMPANY.CODE = TICKET.CCODE 
    LEFT JOIN TEST ON TICKET.TICKETID = TEST.TICKET
    Group by (TICKET.CCODE)
    ORDER BY TICKET_TOTAL DESC

1-重新排序并为来自COMPANY TABLE的指令加注星标

2分钟（TICKET.STARTDATE）获得第一个开始日期（如果需要，使用MAX获取最后开始日期）

3-将内部联接更改为左联接（因为某些公司在故障单表上有票证，但没有在测试表上进行测试）

希望这可以帮助将来的某个人！

内部联接有3个表和2个总和组

1 个答案: