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当我们在 Select List 中使用 Select Query 时，我们可以使用 Order By 子句吗？

我想写这样的查询：-

select col1
     , col2
     , (select colX from table2 where table2.col1=table1.col1 and rownum<2 order by colY desc) 
     , (select colXX from table3 where table3.col1=table1.col1 and rownum<2 order by colYY desc)
from table1;

我不能加入这个表。它只是我想要的例子。

好的。事情就是这样。我有以下用 SQL Server 编写的代码。我想把它转换成甲骨文。

SELECT
BANK_ADDRESS1= (SELECT top 1 OWNER_ADDRESS1 
            FROM OWNER_ADDRESS OA, BANK_ACCOUNT
            WHERE PAYMENT.BANK_ACCOUNT_ID = BANK_ACCOUNT.BANK_ACCOUNT_ID
                    and BANK_ACCOUNT.BANK_ID = OA.OWNER_ID
                    order by Isnull (OA.primary_addr , 'N') desc),
PAYEE_ADD1 = (  SELECT top 1 OWNER_ADDRESS1 
                FROM OWNER_ADDRESS OA 
                WHERE OA.OWNER_ID = PAYEE_OWNER.OWNER_ID 
                order by Isnull (OA.primary_addr , 'N') desc ),
FROM    PAYMENT 
            inner JOIN PAYEE ON PAYMENT.PAYMENT_ID = PAYEE.PAYMENT_ID
            inner join OWNER PAYEE_OWNER on PAYEE_OWNER.OWNER_ID = PAYEE.PAYEE_NAME_ID

希望这会清楚我真正想要的。

4

1 回答 1

2

你想要这样的东西：

select col1,
       col2,
       (select colX
          from (select col1, colX from table2 order by colY desc) table2
         where table2.col1 = table1.col1
           and rownum < 2),
       (select colXX
          from (select col1, colXX from table3 order by colYY desc) table3
         where table3.col1 = table1.col1
           and rownum < 2)
  from table1;

或这个：

select col1,
       col2,
       (select max(colX) keep(dense_rank last order by colY)
          from table2
         where table2.col1 = table1.col1),
       (select max(colXX) keep(dense_rank last order by colYY)
          from table2
         where table2.col1 = table1.col1)
  from table1;

这个子选择

(select colX from table2 where table2.col1=table1.col1 and rownum<2 order by colY desc)

即使它起作用也不会返回您期望的结果，因为 rownum 是在 order by 之前计算的。您将从满足条件 table2.col1 = table1.col1 的那些中获得随机行。

尝试

select (SELECT max(OWNER_ADDRESS1) keep(dense_rank last order by nvl(oa.primary_addr, 'N'))
          FROM OWNER_ADDRESS OA, BANK_ACCOUNT
         WHERE PAYMENT.BANK_ACCOUNT_ID = BANK_ACCOUNT.BANK_ACCOUNT_ID
           and BANK_ACCOUNT.BANK_ID = OA.OWNER_ID) bank_address1,
       (SELECT max(OWNER_ADDRESS1) keep(dense_rank last order by nvl(oa.primary_addr, 'N'))
          FROM OWNER_ADDRESS OA
         WHERE OA.OWNER_ID = PAYEE_OWNER.OWNER_ID) payee_add1
  from PAYMENT
 inner JOIN PAYEE
    ON PAYMENT.PAYMENT_ID = PAYEE.PAYMENT_ID
 inner join OWNER PAYEE_OWNER
    on PAYEE_OWNER.OWNER_ID = PAYEE.PAYEE_NAME_ID

（我可能会犯一些语法错误，无法检查）。

于 2012-08-24T10:52:40.783 回答