Question

我知道我的问题标题不对，抱歉。我真正想做的是：我有2个表，即账户表和历史表如下 - 帐户表

BranchID  | AccountNo
101       |  123456
102       |  123456
102       |  123457

历史表

BranchID |  AccountNo   EmployeeName  | EmployeeType
101      |   123456   |   Mr. ABC     |   PMO
101     |    123456   |  Mr. TRY      |   RO
101     |    123456   |   Mr. OPR     |   Ref
102      |   123456   |   Mr. WER     |   PMO
102      |   123456   |   Mr. CVB     |   Ref
102      |   123457   |   Mr. QSR     |   PMO
102      |   123457   |   Mr. LIT     |   RO
102     |    123457   |   Mr. GHK     |   Ref

我希望合并后的结果为 -

BranchID  | AccountNo | PMOName |   ROName |    RefName
101       |  123456   | Mr. ABC | Mr. TRY  |   Mr. OPR
102       |  123456   | Mr. WER |          |    Mr. CVB
102       |  123457   | Mr. QSR | Mr. LIT  |   Mr. GHK

我怎样才能做到这一点？

Answer 1

以下查询应该获取所需的详细信息。它会做的是 - 遍历所有帐户，然后根据员工类型获取不同的员工姓名。你也可以用连接来做。

SELECT account.branchid BranchID,
    account.accountno AccountNo,
    (SELECT employeename
    FROM history
    WHERE account.branch_id  = history.branch_id
    AND account.accountno    = history.accountno
    AND history.employeetype = 'PMO'
    ) PMOName,
    (SELECT employeename
    FROM history
    WHERE account.branch_id  = history.branch_id
    AND account.accountno    = history.accountno
    AND history.employeetype = 'RO'
    ) ROName,
    (SELECT employeename
    FROM history
    WHERE account.branch_id  = history.branch_id
    AND account.accountno    = history.accountno
    AND history.employeetype = 'Ref'
    ) RefName
FROM account
;

Answer 2

这是基本的透视查询：

select * 
  from account join history using (branchid, accountno)
  pivot (max(employeename) for employeetype in ('PMO' pmo, 'RO' ro, 'Ref' ref))
  order by branchid, accountno

BRANCHID ACCOUNTNO PMO        RO         REF
-------- --------- ---------- ---------- ----------
     101    123456 Mr. ABC    Mr. TRY    Mr. OPR
     102    123456 Mr. WER               Mr. CVB
     102    123457 Mr. QSR    Mr. LIT    Mr. GHK

如何在oracle中将多行值组合成另一个表的一行？

2 个答案: