我无法让 INNER JOIN 工作“ORA 00918”

Question

我有一个查询，它返回我需要的所有正确行，如下所示：

SELECT sequence_no,
MAX(time)
FROM ensapp.shop_order_analysis
WHERE analyzer='SORVI01'
AND part_no in ('PTS228AL','PSS1285')
AND sequence_no in ('6','9','*')
AND SYSDATE-15<time group by sequence_no

但我希望它再返回一列，当我尝试执行 INNER JOIN 时，它会显示“ORA-00918：列不明确定义”。我试图用谷歌搜索，但没有任何意义。这是我尝试过的：

SELECT part_no, sequence_no, time
FROM ensapp.shop_order_analysis a
INNER JOIN(
SELECT sequence_no,
MAX(time)
FROM ensapp.shop_order_analysis
WHERE analyzer='SORVI01'
AND part_no in ('PTS228AL','PSS1285')
AND sequence_no in ('6','9','*')
AND SYSDATE-15<time group by sequence_no) c 
ON a.sequence_no=c.sequence_no

我是 SQL 的初学者。提前致谢

Answer 1

首先，始终限定您的列名。那么你永远不会有这个问题：

SELECT a.part_no, a.sequence_no, a.time
FROM ensapp.shop_order_analysis a INNER JOIN
     (SELECT sequence_no, MAX(time) as maxt
      FROM ensapp.shop_order_analysis
      WHERE analyzer = 'SORVI01' AND
            part_no in ('PTS228AL','PSS1285') AND
            sequence_no in ('6', '9', '*') AND
            SYSDATE-15 < time
      GROUP BY sequence_no
     ) aa
     ON a.sequence_no = aa.sequence_no;

不过，我猜你真的想要：

SELECT a.*, MAX(a.time) OVER () as maxt
FROM ensapp.shop_order_analysis s
WHERE analyzer = 'SORVI01' AND
      part_no in ('PTS228AL','PSS1285') AND
      sequence_no in ('6', '9', '*') AND
      SYSDATE - 15 < time;