ORA-01427：单行子查询返回的行多于更新

如何解决ORA-01427：单行子查询返回的行多于更新

嗨，我正在尝试执行，但遇到错误的单行子查询返回了多行。

 update  upld_mktprice
                        set (upld_mktprice.orig_security,upld_mktprice.stk_exch,upld_mktprice.stk_group,upld_mktprice.instr_type) =
                                                                (select  security.security,nvl(upld_mktprice.stk_exch,nvl(security.stk_exch,'DIRECT')),security.stk_group,decode(upld_mktprice.source,'FOREX','X','S') as instr_type -- HLAMUAT-1457146: Passing DIRECT as a default value for HLAM. confirmed by Dheeren/Prasanth.
                                                                from    v_security_all security
                                                                where   upld_mktprice.security =  Decode(security.asset_type,'OPT',security.stk_sec_id||' '||substr(security.security,instrb(security.security,' ',1,1)+3,length(security.security)),security.stk_sec_id)
                                                                and     rectype = 'L'),upld_mktprice.currency = nvl(upld_mktprice.currency,''),upld_mktprice.value_date = nvl(upld_mktprice.value_date,upld_mktprice.amc_code = 'AMC'
          Where   exists  (select 1
                            from    v_security_all security
                            where   upld_mktprice.security =  Decode(security.asset_type,security.stk_sec_id)
                            and rectype = 'L')
            and     upld_mktprice.orig_security is null
            and       upld_mktprice.user_id       = 'SRINIVAS'
            and       upld_mktprice.source       = 'MKTPRICEMAN';

解决方法

我认为错误几乎可以说明一切。您的查询下面的部分返回多个行。由于我们没有您拥有的数据，因此我们无法进行验证。如果在更新语句中使用了表别名，则进行故障排除也可能会容易一些。

(SELECT security.security,NVL (upld_mktprice.stk_exch,NVL (security.stk_exch,'DIRECT')),security.stk_group,DECODE (upld_mktprice.source,'FOREX','X','S')     AS instr_type -- HLAMUAT-1457146: Passing DIRECT as a default value for HLAM. confirmed by Dheeren/Prasanth.
              FROM v_security_all security
             WHERE     upld_mktprice.security =
                       DECODE (security.asset_type,'OPT',security.stk_sec_id
                                      || ' '
                                      || SUBSTR (security.security,INSTRB (security.security,' ',1,1)
                                                 + 3,LENGTH (security.security)),security.stk_sec_id)
                   AND rectype = 'L')