MySQL错误1054：having子句中的未知列

Question

Query: 查询：

  SELECT SUM(ProductCost) 
    FROM `tblBasket` 
GROUP BY ProductCode
  HAVING BasketSessionID = '3429782d79c68834ea698bb4116eef5e'

Showing Error Like: 显示错误：

1054 - Unknown column 'BasketSessionID' in 'having clause' 1054 - 'having子句'中的未知列'BasketSessionID'

What is the mistake in my query? 我的查询中有什么错误？

替代文字

Answer 1

Try using a where clause in place of the having clause: 尝试使用where子句代替having子句：

SELECT SUM(ProductCost) 
FROM `tblBasket` 
WHERE BasketSessionID ='3429782d79c68834ea698bb4116eef5e'
GROUP BY ProductCode

Answer 2

我想你想使用where子句没有。

Answer 3

HAVING filters out aggregates. HAVING过滤掉聚合。 You should try GROUP BY. 你应该试试GROUP BY。