如何在PL/SQL中加入子查询？

Question

我需要在oracle中加入子查询.这不起作用我得到连接操作的语法错误

select s1.key, s1.value, s2.value 
from ((select key, value
        from tbl 
        where id = 1) as s1
join 
    (select key, value
        from tbl 
        where id = 2) as s2
on s1.contract = s2.contract);

Answer 1

您应该contract在内联视图中选择要加入的字段():

SELECT  s1.key, s1.value, s2.value 
FROM    (
        SELECT contract, key, value
        FROM   tbl 
        WHERE  id = 1
        ) as s1
JOIN    (
        SELECT  contract, key, value
        FROM    tbl 
        WHERE   id = 2
        ) as s2
ON     s1.contract = s2.contract