SQL单行子查询返回多个行

Question

以下查询应返回从动漫中扮演角色的人物的姓名。但我收到以下错误：

Blockquote ORA-01427：单行子查询返回多个行

SELECT P.NAME, 
FROM DBS_PERSON P
WHERE P.ID = (
    SELECT VA.PERSON_ID
    FROM DBS_VOICEACTOR VA
    WHERE VA.PERSON_ID = (
        SELECT AA.PERSON_ID
        FROM DBS_ACTSAS AA
        WHERE AA.CHARACTER_ID = (
            SELECT C.ID
            FROM DBS_CHARACTER C
            WHERE C.ID = (
              SELECT PI.CHARACTER_ID
              FROM DBS_PLAYSIN PI
              WHERE PI.SERIE_ID = (
                SELECT S.ID
                FROM DBS_SERIE S
                WHERE S.ID = '1')))));

提前致谢！

Answer 1

代替

WHERE <field_name> = (SELECT ...

使用

WHERE <field_name> IN (SELECT ...

查询中有5个条件需要更改。

UPD 另外，您的查询等同于

SELECT P.NAME
FROM DBS_PERSON P
     join DBS_ACTSAS AA  on P.PERSON_ID = AA.PERSON_ID
     join DBS_PLAYSIN PI on AA.CHARACTER_ID = PI.CHARACTER_ID
     join DBS_SERIE S    on PI.SERIE_ID = S.ID
WHERE S.ID = '1';