＃1054 - “字段列表”中的未知列“所有者”

Question

我有LOWER(Owner)

列SELECT LOWER(Owner) FROM ...的查询结果

但我希望此LOWER(Owner)代表name，但我的查询错误提示：#1054 - Unknown column 'Owner' in 'field list'

SELECT LOWER(Owner) AS name FROM (
    SELECT LOWER(Owner) FROM ...
) AS buyers

Answer 1

这是因为子查询没有列owner。所以添加这样的别名：

SELECT owner FROM (
    SELECT LOWER(Owner) AS Owner FROM ...
) AS buyers

Answer 2

将别名放在子查询中：

SELECT name
FROM (SELECT LOWER(Owner) as name FROM ...
     ) AS buyers