如何在 PL/SQL 中加入子查询？
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时间：2020-09-01 08:39:53 来源:igfitidea点击:
How to join sub-queries in PL/SQL?
提问by mrt181
i need to join subqueries in oracle. This does not work i get a syntax error for the join operation
我需要在 oracle 中加入子查询。这不起作用我收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);
回答by Quassnoi
You should select the field you are joining on (contract) in the inline views:
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
回答by John Hartsock
You had one too many sets of Parenthesis.
你有一组太多的括号。
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;
回答by Parris Varney
Get rid of the outer most parenthesis.
去掉最外面的括号。
