Mysql 如何在同一查询中使用GROUPBY和left和inner join？

我使用一个带有内部联接和左联接的查询从3个表中获取数据。我还想通过使用matname来使用group。因为将有来自同一matname的多个输出。我想得到它们的总和

表tbl_销售额

+------------+--------------+---------------+----------+--------+---------+
| 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\U mas\U材料

+---------+--------------+--------+
| matnum  | matname      | matgrp | 
+---------+--------------+--------+
| 2000011 | name1        | FG0001 | 
| 2000012 | name2        | FG0001 |  
| 2000013 | name3        | FG0001 |    
| 2000014 | name4        | FG0001 |   
| 2000015 | name5        | FG0001 |    
+---------+--------------+--------+

表tbl\U mas\U客户

+---------+----------+--------+
| customer| rep      | namez  | 
+---------+----------+--------+
| 2000011 | 501      | ddd    | 
| 2000012 | 502      | bbb    |  
| 2000013 | 501      | zzz    |    
| 2000014 | 501      | qqq    |   
| 2000015 | 503      | ttt    |    
+---------+----------+--------+

我想获得特定代表销售的特定物料组（matgrp）及其名称（matname）的数量（每个数量）

这就是我使用的查询。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'

但是我想使用matname对它们进行分组，因为我想得到使用相同名称的物料的数量之和。但如果我最后按matname添加group，它将不会给出正确的输出和数量之和

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"}]}

根据tbl_mas_material.matname分组

{"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"}]}

---

问题是输出不是我想要的。例如，请参见matname:null。小组使用后只给了我22分。但是我想要它们的总和（matname为null）：22+38+11+11+22+5-5+7=111

好吧，我在这里做一个猜测，因为您没有共享准确的预期输出。但是，基于您编写的希望“获取数量总和”的事实，并且在当前输出中，未对

qty\u ach

进行求和，因此您在查询中未使用

sum（）

group by函数。没有这一点，MySQL无法判断您想要对该字段求和

本例中的查询类似于以下内容：

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

---

见@krishnpatel。没有兄弟，我想用matname分组。不是客户。顺便说一句，我是根据你来测试的。那也不是working@krishnpatel因为该表有rep（repid“501/502/…”），是的，这就是我一直在等待的：对意外行为的清晰描述。你必须明白，我们不是读心术的人，我们不知道你在追求什么，除非你向我们描述一下。在这个特殊的案例中，我确实猜到了问题所在，但你不应该依赖于此。下次请提供一个有意义的描述什么出了问题。@Shadow。很抱歉。我会接受你的回答。成功了。非常感谢。