Question

尽管使用TOP 1，子查询仍返回多行。

我一生中一直使用MS SQL，我确定以下代码可以工作，但在Oracle（NetSuite）中则行不通。

我正在尝试使用TRANSACTION_ID列将表TRANSACTIONS中的行与表SYSTEM_NOTES中的行连接起来，这样对于TRANSACTIONS中的每一行都应只返回SYSTEM_NOTES中的一行。

SYSTEM_NOTES表可能没有行，也可能没有一行或多行，而TRANSACTION_ID与TRANSACTION表中的行匹配。

查询应仅返回最新行（根据SYSTEM_NOTES表中的DATE_CREATED列确定）。

SELECT 
    SS.NAME AS "ENTITY NAME", 
    TL.TRANSACTION_ID AS "TRANSACTION INTERNAL ID", 
    WF.VALUE_NEW AS "APPROVED BY",
    WF.DATE_CREATED AS "APPROVED DATE",
    TL.AMOUNT AS "AMOUNT (entity currency)",
    (CASE WHEN TL.AMOUNT_FOREIGN IS NULL THEN TL.AMOUNT ELSE TL.AMOUNT_FOREIGN END) AS "AMOUNT (original currency)",
    CY.SYMBOL AS "CURRENCY CODE"
FROM TRANSACTIONS TS
LEFT OUTER JOIN ACCOUNTS AC ON TL.ACCOUNT_ID  = AC.ACCOUNT_ID
LEFT OUTER JOIN ACCOUNTING_PERIODS AP ON TS.ACCOUNTING_PERIOD_ID = AP.ACCOUNTING_PERIOD_ID
LEFT OUTER JOIN 

/* The following part for some entries returns more than one row despite using TOP 1 */

(SELECT TOP 1 SN.TRANSACTION_ID, SN.VALUE_NEW, SN.DATE_CREATED FROM SYSTEM_NOTES SN WHERE SN.STANDARD_FIELD = 'NEXTAPPROVER' AND SN.VALUE_NEW IS NOT NULL
ORDER BY SN.DATE_CREATED DESC) 
WF ON WF.TRANSACTION_ID = TS.TRANSACTION_ID
/* End of the faulty part */

WHERE TL.AMOUNT IS NOT NULL AND TL.AMOUNT <> 0
AND TS.IS_NON_POSTING = N'No'
AND (AP.QUARTER = N'No' AND AP.YEAR_0 = N'No' AND CAST(AP.STARTING AS DATE) BETWEEN {d '2018-12-01'} AND {d '2018-12-01'})

当我单独为一个事务ID运行子查询时，我仅得到预期的1行（SYSTEM_NOTES表中有三个具有该ID的条目）。

SELECT TOP 1 
SN.TRANSACTION_ID, 
SN.VALUE_NEW, SN.DATE_CREATED FROM SYSTEM_NOTES SN WHERE SN.STANDARD_FIELD = 'NEXTAPPROVER' AND SN.VALUE_NEW IS NOT NULL AND SN.TRANSACTION_ID = 171954
    ORDER BY SN.DATE_CREATED DESC

我也尝试了以下代码，但是row_number（）部分在我的系统中似乎不起作用。

SELECT SN.TRANSACTION_ID, SN.VALUE_NEW, SN.DATE_CREATED,
ROW_NUMBER() OVER (ORDER BY SN.DATE_CREATED DESC ) AS ROW_NUM
 FROM SYSTEM_NOTES SN 
WHERE SN.STANDARD_FIELD = 'NEXTAPPROVER' AND SN.VALUE_NEW IS NOT NULL
AND SN.TRANSACTION_ID = 171954

Answer 1

我认为您应该使用rownum而不是TOP。

语法：

 select * from dual where /*conditions*/ and rownum = 1

我为你做了一个例子：

带有rownum：

Example - rownum = 1

带有row_number：

Example - row_number()

带有TOP 1的子查询在Oracle NetSuite中返回多行

1 个答案: