如何将同一个表和同一列中的数据连接到两个不同的列

Question

LN_REF_NO是贷款的参考编号。 LN_REF_NO必须有一个ACNO和一个LRAC。

他们两人都在ACNO专栏下存入账户。

我将如何分开他们？ PLS看图像

ALTER PROCEDURE sp_FinalLoanPayment
AS

DECLARE @LN_REF_NO char(13)

DECLARE @TempA
    TABLE (
        [LN_REF_NO] [char](13),
        [Status] [varchar](15),
        [ACNO] [varchar](21),
        [ACNOBalance] [dbo].[Amount]
  )

DECLARE @TempL
    TABLE (
        [LN_REF_NO] [char](13),
        [Status] [varchar](15),
        [LRAC] [varchar](21),
        [LRACBalance] [dbo].[Amount]
  )
DECLARE @TempAll
    TABLE (
        [LN_REF_NO] [char](13),
        [Status] [varchar](15),
        [ACNO] [varchar](21),
        [ACNOBalance] [dbo].[Amount],
        [LRAC] [varchar](21),
        [LRACBalance] [dbo].[Amount]

  )

INSERT INTO @TempL (LN_REF_NO ,Status,LRAC,LRACBalance)
SELECT Loan.LN_REF_NO, Loan.Status,ACCOUNTS.ACNO ,ACCOUNTS.BALANCE 
FROM Loan
INNER JOIN Accounts
ON LOAN.LRAC = ACCOUNTS.ACNO  
WHERE Loan.Status ='Paid' AND ACCOUNTS.BALANCE>0 


INSERT INTO @TempA (LN_REF_NO ,Status,ACNO,ACNOBalance)
SELECT Loan.LN_REF_NO, Loan.Status,ACCOUNTS.ACNO ,ACCOUNTS.BALANCE 
FROM Loan
INNER JOIN Accounts
ON LOAN.ACNO = ACCOUNTS.ACNO  
WHERE Loan.Status ='Paid' AND ACCOUNTS.BALANCE<0  

-- START CURSOR 1
DECLARE @cursor CURSOR 
SET @cursor = CURSOR FOR
select LN_REF_NO from @TempL
OPEN @cursor

FETCH NEXT
FROM @cursor INTO 
        @LN_REF_NO

WHILE (@@FETCH_STATUS = 0)
BEGIN

INSERT INTO @TempAll (LN_REF_NO ,Status,ACNO,ACNOBalance)
select LN_REF_NO,Status,ACNO,ACNOBalance
from @TempA
where LN_REF_NO = @LN_REF_NO 

FETCH NEXT
FROM @cursor INTO 
        @LN_REF_NO

END


CLOSE @cursor
DEALLOCATE @cursor

-- CURSOR 1 END


select * from @TempAll order by LN_REF_NO

结果：

Answer 1

我认为您应该能够在需要时使用此查询获取此数据：

SELECT
    ln.LN_REF_NO, ln.Status, a1.ACNO, a1.BALANCE, a2.ACNO, a2.BALANCE
FROM
    dbo.Loan ln
INNER JOIN
    dbo.Accounts a1 ON ln.LRAC = a1.ACNO
INNER JOIN
    dbo.Accounts a2 ON ln.ACNO = a2.ACNO
WHERE
    ln.Status = 'Paid'
    AND a1.Balance > 0
    AND a2.Balance > 0

您基本上只需加入Accounts表两次 - 一次是指向Loan.LRAC的链接，另一次指向Loan.ACNO上的链接。

基于这两个连接，您只需从所需的所有连接表中选择那些列 - 这就是真正的全部！没有光标，没有临时表 - 没有必要的东西！