MYSQL - 在單行

Question

選擇多行我有MYSQL表命名爲permit_bills其中包含爲bill_no，alcohol_typ，origin，2000ml，1000ml，bill_date列。表如下所示：

+---------+--------------+---------+--------+--------+-----------+ 
    | bill_no | alcohol_typ | origin | 2000ml | 1000ml | bill_date | 
    +---------+------------- + --------+--------+--------+-----------+ 
    | 2001 | s   | f  | 2 | 1 |01-02-2017 | 
    | 2001 | m   | w  | 3 | 4 |01-02-2017 | 
    +---------+--------------+---------+--------+--------+-----------+ 

我希望用他們bill_no和bill_date選擇從上面表中的所有行到單個行和要顯示的2000ml和1000ml列按他們alcohol_typ和`原點。

我的產出表必須是這樣的：

+---------+--------------+-------------+------------+------------+-----------+ 
    | bill_no | s_f_2000ml | s_f_1000ml | m_w_2000ml | m_w_1000ml | bill_date | 
    +---------+------------- + ------------+------------+------------+-----------+ 
    | 2001 |  2  |  1  |  3  |  4  |01-02-2017 | 
    +---------+--------------+-------------+------------+------------+-----------+ 

Answer 1

試試這個（支點）查詢 -

SELECT 
    bill_no, 
    MAX(IF(alcohol_typ = 's' AND origin = 'f', `2000ml`, NULL)) AS s_f_2000ml, 
    MAX(IF(alcohol_typ = 's' AND origin = 'f', `1000ml`, NULL)) AS s_f_1000ml, 
    MAX(IF(alcohol_typ = 'm' AND origin = 'w', `2000ml`, NULL)) AS m_w_2000ml, 
    MAX(IF(alcohol_typ = 'm' AND origin = 'w', `1000ml`, NULL)) AS m_w_1000ml, 
    bill_date 
FROM permit_bills 
    GROUP BY bill_no, bill_date 

Answer 2

你確定你的輸出表需求的樣子嗎？

您可能可以使用GROUP_CONCAT功能，它有時是一個非常有用的工具。您將需要在應用程序中拆分或分解值，但它可能是您所需要的。

https://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html#function_group-concat