Question

我有3个表A B和C.我想首先处理表A和B以创建表'AB'然后将结果连接到C.这是我的想法：

select C.number, C.class, AB.name
from C,
  (select A.name, A.number
  from A
  FULL OUTER JOIN B
  ON A.number = B.number) AB
FULL OUTER JOIN AB
ON AB.number = C.number

然而它似乎没有起作用。现在我不确定A＆amp; B的结果是否可以在Oracle DB中使用别名。该如何以正确的方式完成？

Answer 1

 SELECT C.number, 
        C.class, 
        AB.name
 FROM C
 FULL OUTER JOIN
             (SELECT A.name, 
                     A.number
              FROM A
              FULL OUTER JOIN B
              ON A.number = B.number) AB
   ON AB.number = C.number

Oracle - 使用表别名加入操作

1 个答案: