如何在一列有多个条目的列上使用group by？

Question

我想在一个包含许多条目的列上使用group by

表-A

Name price
AAA  12
BBB  13
AAA  0
CCC  24
AAA  0
DDD  0

现在我想找出Name Price作为0

但是由于我有条目AAA 3次，我无法直接用条件编写简单的sql NOT Equal to 0

请帮帮我，我想打印上面的表格_a应该是

仅D因为0为price。

Answer 1

我假设价格不能低于零：

SELECT Name
FROM TableName
GROUP BY Name
HAVING SUM(price) = 0

或者只有一个价格的附加条件，即零

SELECT Name
FROM TableName
GROUP BY Name
HAVING COUNT(*) = 1 AND SUM(price) = 0

Answer 2

您可以使用聚合函数GROUP BY和HAVING子句来实现此目的：

SQLFiddle Demo

SELECT name,SUM(price) as price
FROM table 
GROUP BY name
HAVING SUM(price) = 0

Answer 3

select name,max(price) as price from table group by name having max(price) =0

Answer 4

select name,max(price)
group by name
having max(price)=0