Question

我有桌面材料

 - id int,
 - name varchar(50),
 - content text,
 - quantity double,

不使用group by

的查询

1, product1, content1, 25
2, product2, content2, 4 
3, product1, content3, 35
4, product3, content4, 15

具有分组依据和SUM数量的查询

 product1, content1, SUM(quantity) : 60
 product2, content2, SUM(quantity) : 4 
 product3, content4, SUM(quantity) : 15

例如，如果我有总和数量= 0

 product1, content1, SUM(quantity) : 0
 product2, content2, SUM(quantity) : 4 
 product3, content3, SUM(quantity) : 15

我会删除所有产生总和数量= 0的产品。例如：从id = 1中删除产品1，从id = 3中删除产品1

1, product1, content1 
3, product1, content3

Answer 1

你可以这样做：

DELETE t
FROM `material` t
INNER JOIN(SELECT s.name FROM `material` s
           GROUP BY s.name
           HAVING sum(s.quantity) = 0)
 ON(t.name = s.name)

如何使用SELECT SUM（）FROM表GROUP BY删除

1 个答案: