要修改或更正SQL查询吗

运行此查询时：

select sm.stylename, 
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Name') as "VENDOR NAME",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Number') as "VENDOR NUMBER",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Address') as "VENDOR ADDRESS",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Name') as "FACTORY NAME",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Address') as "FACTORY ADDRESS"
from stylemaster sm order by sm.stylename;

我收到错误消息：

"ORA-01427: single-row subquery returns more than one row
01427. 00000-"single-row subquery returns more than one row"

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能否帮助解决此问题？

您的一个子查询返回了多个值。您可以通过添加

其中rownum=1

或聚合函数来修复症状：

select sm.stylename, 
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Name') as "VENDOR NAME",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Number') as "VENDOR NUMBER",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Address') as "VENDOR ADDRESS",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Name') as "FACTORY NAME",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Address') as "FACTORY ADDRESS"
from stylemaster sm
order by sm.stylename;

这将解决问题，但您可能需要调查为什么会出现重复项

编辑：

如果

max（）

对您的数据类型无效，请使用

rownum=1

：

select sm.stylename, 
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Name' and rownum = 1) as "VENDOR NAME",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Number' and rownum = 1) as "VENDOR NUMBER",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Address' and rownum = 1) as "VENDOR ADDRESS",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Name' and rownum = 1) as "FACTORY NAME",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Address' and rownum = 1) as "FACTORY ADDRESS"
from stylemaster sm
order by sm.stylename;

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当我运行上述查询时，我收到错误消息“ORA-00932:不一致的数据类型：预期的-得到CLOB 00932.00000-“不一致的数据类型：预期的%s得到的%s”*原因：*操作：@omprakashv。将字段值存储为

CLOB

s似乎有些过分，通常是个坏主意。