Question

我有一个带有以下字段的交易表：

TRAN_ID    DATE     ACCNT_ID    NAME      AMOUNT    TRAN_TYPE

对于给定的交易，它借记一个客户的帐户并贷记另一个客户的帐户，我可以拥有：

客户1

TRAN_ID    DATE     ACCNT_ID     NAME      AMOUNT    TRAN_TYPE
0000001   10/10/17     AA1     Joe Burns     50        Debit

客户2：

TRAN_ID    DATE     ACCNT_ID     NAME      AMOUNT    TRAN_TYPE
0000001   10/10/17     AA2     Mary Adams    50        Credit

是否可以在此表上进行联接，以显示交易ID，发送者，接收者和金额？

Answer 1

您可以这样尝试，自行加入表格，其中一张用于借记，另一张用于借记，

SELECT R.NAME as RECIEVER,S.NAME as SENDER,R.AMOUNT as AMOUNT
FROM
        (Select * from
        Table
        where TRAN_TYPE='Debit') as R
        INNER JOIN
        (Select * from
        Table
        where TRAN_TYPE='Credit') as S
        on R.TRAN_ID=S.TRAN_ID

Answer 2

我想是自我加入：

SQL> with tran (tran_id, datum, accnt_id, name, amount, tran_type) as
  2    (select '001', date '2017-10-10', 'aa1', 'Joe Burns' , 50, 'Debit' from dual
  3     union all
  4     select '001', date '2017-10-10', 'aa2', 'Mary Adams', 50, 'Credit' from dual
  5    )
  6  -- self-join
  7  select c.tran_id, c.datum, c.name credit_name, d.name debit_name, c.amount
  8  from tran c join tran d on c.tran_id = d.tran_id
  9       and c.tran_type = 'Credit'
 10       and d.tran_type = 'Debit';

TRA DATUM    CREDIT_NAM DEBIT_NAME     AMOUNT
--- -------- ---------- ---------- ----------
001 10.10.17 Mary Adams Joe Burns          50

SQL>

Answer 3

您可以进行自我加入：

select tr.tran_id, tr.name as receiver, ts.name as sender,
       tr.amount
from transactions tr join
     transactions ts
     on tr.tran_id = ts.tran_id and
        tr.tran_type = 'credit' and
        ts.tran_type = 'debit';

请注意，这不会检查amount和date列是否相同。而且，它仅返回同时具有两个记录的交易。

在同一表格中的ID上关联交易

3 个答案: