ORA-01427：单行子查询为以下查询返回多个行

当我在sql开发人员中执行以下查询时，出现以下错误消息 “Ora-01427单行子查询返回多于一行“ORA-01427：单行子查询为以下查询返回多个行

select TPNATIVENAME as PTPNAME, 
     INTERFACENAME as CTPNAME, 
     DIRECTIONALITY, 
     NENAME, 
     NCNAME 
from TP , 
    (select DIRECTIONALITY 
    from SNCCOMPONENT 
    where SNCID = 
     (select unique SNCID 
     from AFFECTEDXCS 
     where PXCID = -124)), 
    (select NODE.NAME as NENAME, 
      NC.NAME as NCNAME 
    from NODE NODE, 
     NETWORKCONTROLLER NC 
    where NODE.HANDLE = 
     (select unique SRCNEID 
     from SNCCOMPONENT 
     where SNCID = 
      (select unique SNCID 
      from AFFECTEDXCS 
      where PXCID = -124)) 
    and NC.HANDLE = NODE.NCHANDLE) 
where NEID = 
    (select SRCNEID 
    from SNCCOMPONENT 
    where SNCID = 
     (select unique SNCID 
      from AFFECTEDXCS 
      where PXCID = -124)) 
    and TPID = 
    (select SRCTP 
    from SNCCOMPONENT 
    where SNCID = 
     (select unique SNCID 
      from AFFECTEDXCS 
      where PXCID = -124)) 
union 
select TPNATIVENAME as PTPNAME, 
     INTERFACENAME as CTPNAME, 
     DIRECTIONALITY, 
     NENAME, 
     NCNAME 
from TP, 
    (select DIRECTIONALITY 
    from SNCCOMPONENT 
    where SNCID = 
     (select unique SNCID 
     from AFFECTEDXCS 
     where PXCID = -124)), 
    (select NODE.NAME as NENAME, 
      NC.NAME as NCNAME 
    from NODE NODE, 
     NETWORKCONTROLLER NC 
    where NODE.HANDLE = 
     (select unique SRCNEID 
     from SNCCOMPONENT 
     where SNCID = 
      (select unique SNCID 
      from AFFECTEDXCS 
      where PXCID = -124)) 
    and NC.HANDLE = NODE.NCHANDLE) 
where NEID = 
    (select SINKNEID 
    from SNCCOMPONENT 
    where SNCID = 
     (select unique SNCID 
      from AFFECTEDXCS 
      where PXCID = -124)) 
    and TPID = 
    (select SINKTP 
    from SNCCOMPONENT 
    where SNCID = 
     (select unique SNCID 
      from AFFECTEDXCS 
      where PXCID = -124));

我没有得到哪个内部查询返回多个值以及如何解决这个错误？

来源

2014-09-01 user3924682

您需要缩小问题范围。每个单独的子查询都是独立的，并确定它是否返回多行。除非你要给我们一个可重复的测试用例，否则我们无法真正做很多调试问题。 – 2014-09-01 06:10:03

她可以找到一个sql格式化程序：http://sqlformat.org/ – miracle173 2014-09-01 06:46:17

SELECT UNIQUE X FROM Y

此查询不保证您的查询将返回单行。它可能会返回多行。它只保证它不会多次返回相同的X.

因此，您需要使用IN而不是=。

例如：

SELECT SINKTP FROM SNCCOMPONENT 
WHERE SNCID IN (SELECT UNIQUE SNCID FROM AFFECTEDXCS WHERE PXCID = -124)

来源

2014-09-01 06:12:17 yalpertem

确保这些SQL只给你一个值：

SELECT UNIQUE SNCID 
    FROM AFFECTEDXCS 
WHERE PXCID = -124 

SELECT SRCNEID 
    FROM SNCCOMPONENT 
WHERE SNCID = (
       SELECT UNIQUE SNCID 
        FROM AFFECTEDXCS 
       WHERE PXCID = -124 
       ) 

SELECT UNIQUE SRCNEID 
    FROM SNCCOMPONENT 
WHERE SNCID = (
       SELECT UNIQUE SNCID 
        FROM AFFECTEDXCS 
       WHERE PXCID = -124 
       ) 

SELECT SINKNEID 
    FROM SNCCOMPONENT 
WHERE SNCID = (
       SELECT UNIQUE SNCID 
        FROM AFFECTEDXCS 
       WHERE PXCID = -124 
       ) 

SELECT SINKTP 
    FROM SNCCOMPONENT 
WHERE SNCID = (
       SELECT UNIQUE SNCID 
        FROM AFFECTEDXCS 
       WHERE PXCID = -124 
       )

如果一个（或多个）将返回一个以上行，作为一个快速解决方案，您可以将rownum < 2谓词添加到where子句或将=标识替换为IN字。

来源

2014-09-01 07:59:10 zaratustra

ORA-01427：单行子查询为以下查询返回多个行

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