如何在 Athena 中修复连接中的选择语句？

问题描述

此查询在 Redshift 中有效，但在 Amazon Athena 中无效：

    SELECT disTINCT t1.place_id,t1.date,flg
    FROM rec t1
    LEFT JOIN (
      SELECT date,place_id,CASE WHEN COUNT(*) > 0 THEN 1 ELSE 0 END AS flg
      FROM rec
      GROUP BY date,place_id
    ) t2 ON t1.one_year_ago_dow_day = t2.date AND t1.place_id = t2.place_id

错误信息是：

------------------------------------------
Your query has the following error(s):

Syntax_ERROR: line 84:39: Column 't2.date' cannot be resolved

This query ran against the "~~~" database,unless qualified by the query. Please post the error message on our forum or contact customer support with Query Id: 29311d73-2cdb-4279-b88c-xxxxxxx
--------------------------------------

错误说“t2.date”是问题所在，是不是因为我在左连接中选择了表？

如何让这个 sql 在 Athena 中工作？

任何见解将不胜感激。

解决方法

如果 date 字段导致问题（如@Deepstop 所建议），您可以尝试：

    SELECT DISTINCT t1.place_id,t1.date,flg
    FROM rec t1
    LEFT JOIN (
      SELECT
        date as date1,-- Changed here,and in the ON below
        place_id,CASE WHEN COUNT(*) > 0 THEN 1 ELSE 0 END AS flg
      FROM rec
      GROUP BY date,place_id
    ) t2 ON (t1.one_year_ago_dow_day = t2.date1) AND (t1.place_id = t2.place_id)