我正在使用内部联接和左联接的查询来从3个表中获取数据。我也想使用matname来使用group。因为同一个matname会有多个输出。我想得到它们的总和。
表tbl_sales
+------------+--------------+---------------+----------+--------+---------+
| company | customer | date | material | matgrp | qty_ach |
+------------+--------------+---------------+----------+--------+---------+
| 2100 | 30000002 | 2017-01-10 | 2000012 | FG0001 | 2 |
| 2200 | 30000002 | 2017-01-10 | 2000012 | FG0001 | 4 |
| 2100 | 30000003 | 2017-01-10 | 2000011 | FG0001 | 5 |
| 2100 | 30000002 | 2017-01-11 | 2000024 | FG0001 | 4 |
| 2300 | 30000004 | 2017-01-11 | 2000010 | FG0001 | 1 |
+------------+--------------+---------------+----------+--------+---------+
表tbl_mas_material
+---------+--------------+--------+
| matnum | matname | matgrp |
+---------+--------------+--------+
| 2000011 | name1 | FG0001 |
| 2000012 | name2 | FG0001 |
| 2000013 | name3 | FG0001 |
| 2000014 | name4 | FG0001 |
| 2000015 | name5 | FG0001 |
+---------+--------------+--------+
表tbl_mas_customer
+---------+----------+--------+
| customer| rep | namez |
+---------+----------+--------+
| 2000011 | 501 | ddd |
| 2000012 | 502 | bbb |
| 2000013 | 501 | zzz |
| 2000014 | 501 | qqq |
| 2000015 | 503 | ttt |
+---------+----------+--------+
我想获得特定材料组（matgrp）的数量（qty_ach）及其特定代表已售出的名称（matname）。
这是我使用的查询。这给了我正确的输出。
SELECT tbl_mas_material.matname, tbl_sales.qty_ach
FROM salesforce.tbl_sales
inner join salesforce.tbl_mas_customer on salesforce.tbl_mas_customer.customer = salesforce.tbl_sales.customer
left join salesforce.tbl_mas_material on salesforce.tbl_mas_material.matnum = salesforce.tbl_sales.material
where salesforce.tbl_sales.matgrp = 'FG0001'
and DATE_FORMAT(date, '%Y-%m') = '2017-01'
and salesforce.tbl_mas_customer.rep = '501'
但是我希望使用 matname 对他们进行分组，因为我想使用相同名称的材料获取qty_ach的总和。但是如果我最后用matname添加group，它就不会给我正确的输出和qty_ach的总和
没有分组
{"feed":[
{"matname":"3.00-10 4PR SECURA NEO TL CEAT","qty_ach":"5"},
{"matname":"3.50-10 04PR SECURA NEO CEAT","qty_ach":"2"},
{"matname":"3.00-18 6PR SECURA ZOOM TL","qty_ach":"1"},
{"matname":"2.75-17 04PR SECURA ZOOM CEAT (F)","qty_ach":"17"},
{"matname":"3.00-18 06PR SECURA SPORT CEAT (R)","qty_ach":"3"},
{"matname":"100\/90-18 GRIPP TL CEAT","qty_ach":"5"},
{"matname":"100\/90-17 GRIPP TL CEAT","qty_ach":"6"},
{"matname":"2.75-18 04PR SECURA ZOOM (F)","qty_ach":"-11"},
{"matname":"3.00-17 06PR SECURA ZOOM CEAT (R)","qty_ach":"-11"},
{"matname":"3.00-17 06PR SECURA ZOOM CEAT (R)","qty_ach":"11"},
{"matname":"3.00-17 04PR GRIPP","qty_ach":"33"},
{"matname":null,"qty_ach":"22"},
{"matname":"3.00-17 06PR SECURA ZOOM CEAT (R)","qty_ach":"11"},
{"matname":"2.50-17 04PR SECURA SPORT CEAT (R)","qty_ach":"4"},
{"matname":"2.50-17 04PR SECURA ZOOM FX (F)","qty_ach":"3"},
{"matname":"2.75-17 04PR SECURA ZOOM CEAT (F)","qty_ach":"2"},
{"matname":"3.00-17 06PR SECURA ZOOM CEAT (R)","qty_ach":"22"},
{"matname":"3.00-17 06PR SECURA ZOOM CEAT (R)","qty_ach":"6"}
{"matname":"100\/90-17 SECURA ZOOM CEAT TL","qty_ach":"22"},
{"matname":"100\/90-17 SECURA ZOOM CEAT TL","qty_ach":"5"},
{"matname":"100\/90-17 SECURA ZOOM CEAT TL","qty_ach":"6"},
{"matname":"100\/90-18 6PR SECURA ZOOM TL","qty_ach":"12"},
{"matname":"3.00-18 6PR SECURA ZOOM TL","qty_ach":"4"},
{"matname":"2.75-14 06PR SECURA 275","qty_ach":"2"},
{"matname":"2.75-14 06PR SECURA 275","qty_ach":"6"},
{"matname":"2.75-17 04PR SECURA ZOOM TL","qty_ach":"10"},
{"matname":"2.75-17 04PR SECURA ZOOM TL","qty_ach":"3"},
{"matname":"2.75-17 04PR SECURA ZOOM TL","qty_ach":"27"},
{"matname":"2.75-17 04PR SECURA ZOOM TL","qty_ach":"27"},
{"matname":"3.00-17 04PR GRIPP","qty_ach":"33"},
{"matname":"3.00-17 04PR GRIPP","qty_ach":"11"},
{"matname":"100\/90-18 GRIPP TL CEAT","qty_ach":"5"},
{"matname":"120\/80-17 SECURA PULSE","qty_ach":"6"},
{"matname":"100\/90-17 GRIPP TL CEAT","qty_ach":"5"},
{"matname":null,"qty_ach":"22"},
{"matname":null,"qty_ach":"38"},
{"matname":null,"qty_ach":"11"},
{"matname":null,"qty_ach":"11"},
{"matname":null,"qty_ach":"22"},
{"matname":null,"qty_ach":"5"},
{"matname":null,"qty_ach":"-5"},
{"matname":null,"qty_ach":"7"}]}
with group by tbl_mas_material.matname
{"feed":[{"matname":null,"qty_ach":"22"},
{"matname":"100\/90-17 GRIPP TL CEAT","qty_ach":"6"},
{"matname":"100\/90-17 SECURA ZOOM CEAT TL","qty_ach":"22"},
{"matname":"100\/90-18 6PR SECURA ZOOM TL","qty_ach":"12"},
{"matname":"100\/90-18 GRIPP TL CEAT","qty_ach":"5"},
{"matname":"120\/80-17 SECURA PULSE","qty_ach":"6"},
{"matname":"2.50-17 04PR SECURA SPORT CEAT (R)","qty_ach":"4"},{"matname":"2.50-17 04PR SECURA ZOOM FX (F)","qty_ach":"3"},
{"matname":"2.75-14 06PR SECURA 275","qty_ach":"2"},
{"matname":"2.75-17 04PR SECURA ZOOM CEAT (F)","qty_ach":"17"},
{"matname":"2.75-17 04PR SECURA ZOOM TL","qty_ach":"10"},
{"matname":"2.75-18 04PR SECURA ZOOM (F)","qty_ach":"-11"},
{"matname":"3.00-10 4PR SECURA NEO TL CEAT","qty_ach":"5"},
{"matname":"3.00-17 04PR GRIPP","qty_ach":"33"},
{"matname":"3.00-17 06PR SECURA ZOOM CEAT (R)","qty_ach":"-11"},{"matname":"3.00-18 06PR SECURA SPORT CEAT (R)","qty_ach":"3"},
{"matname":"3.00-18 6PR SECURA ZOOM TL","qty_ach":"1"},
{"matname":"3.50-10 04PR SECURA NEO CEAT","qty_ach":"2"}]}
问题在于输出不是我想要的。请参阅matname：null。它只给了我22后使用组。但我想要它们的总和（matname为null）：22 + 38 + 11 + 11 + 22 + 5-5 + 7 = 111
答案 0 :(得分：1)
嗯，我在这里猜测，因为你没有分享确切的预期输出。但是，根据您编写的事实，您希望“获取qty_ach的总和”并且在当前输出qty_ach中没有总结，您在查询中没有使用sum() group by函数。没有它，MySQL无法告诉你想要总结这个字段。
在这种情况下，查询看起来像下面的行：
SELECT tbl_mas_material.matname, sum(tbl_sales.qty_ach) as qty_ach_sum
FROM salesforce.tbl_sales
inner join salesforce.tbl_mas_customer on salesforce.tbl_mas_customer.customer = salesforce.tbl_sales.customer
left join salesforce.tbl_mas_material on salesforce.tbl_mas_material.matnum = salesforce.tbl_sales.material
where salesforce.tbl_sales.matgrp = 'FG0001'
and DATE_FORMAT(date, '%Y-%m') = '2017-01'
and salesforce.tbl_mas_customer.rep = '501'
group by tbl_mas_material.matname