我无法成功运行查询
select session from (select F_SESSION as session
FROM T_TEMP GROUP BY F_SESSION ) a ;
以上成功运行。但是，以下一项失败
select session, count(total) from (select F_SESSION as session,
case when F_RECORDED_VALUE != 0 then F_RECORDED_VALUE end as total FROM T_TEMP GROUP BY F_SESSION ) a ;
错误是
FAILED: SemanticException [Error 10025]: Line 4:30 Expression not in GROUP BY key '0'
有人可以指出我要去哪里了吗？
select session, count(total) from (select F_SESSION as session,
case when F_RECORDED_VALUE != 0 then F_RECORDED_VALUE end as total FROM T_TEMP ) a
group by session;
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