mysql - 获取与另一个表不匹配的行

Question

我有一个工作查询，它​​按照我喜欢的方式生成数据，但现在我希望它添加另一个子句语句，该语句将从 tbl_loan_master 获取不在 tbl_loanledger 上的行.

示例数据:

tbl_借款人

------------------------------------------
| id | first_name | last_name | deleted  |
|  1 |     Joe    |   Smith   |    0     |
|  2 |    Lily    |    Mag    |    0     |
|  3 |     Zen    |   Green   |    0     |
|  4 |    Kim     |   Chan    |    0     |
|  5 |    Bob     |   Mac     |    1     |
|  6 |    Ben     |  Cork     |    0     |
------------------------------------------

tbl_loan_master

----------------------------------------------------------------------
| id | borrowers_id |  loan  | date_created |  due_date  |  deleted  |
|  1 |       4      |  300   |   2016/04/28 | 2017/04/28 |     0     |
|  2 |       1      |  100   |   2016/05/05 | 2017/05/05 |     0     |
|  3 |       2      |  500   |   2016/06/08 | 2017/06/08 |     0     |
|  4 |       1      |  200   |   2016/06/13 | 2017/06/13 |     0     |
|  5 |       3      |  150   |   2016/06/15 | 2017/06/15 |     0     |
|  6 |       6      |   50   |   2016/06/16 | 2017/06/16 |     0     |
----------------------------------------------------------------------

tbl_loanledger

------------------------------------------------------------------------------
| id | borrowers_id | loanmaster_id | payment | balance| date_created | deleted
|  1 |       4      |      1        |    50   |   250  |  2016/05/28  |   0
|  2 |       1      |      2        |    20   |    80  |  2016/05/25  |   0
|  3 |       1      |      2        |    30   |    50  |  2016/06/01  |   0
|  4 |       2      |      3        |   100   |   400  |  2016/06/09  |   0
|  5 |       2      |      3        |    50   |   350  |  2016/06/10  |   0
|  6 |       3      |      4        |    50   |   150  |  2016/06/16  |   0
------------------------------------------------------------------------------

这是工作查询:

$query = "SELECT `tbl_borrowers`.* , `tbl_loanledger`.*, `tbl_loan_master`.*
    FROM `tbl_borrowers` 
    LEFT JOIN `tbl_loanledger` 
        ON `tbl_borrowers`.id = `tbl_loanledger`.borrower_id
    LEFT JOIN `tbl_loan_master`
         ON `tbl_loan_master`.id = `tbl_loanledger`.loanmaster_id
    WHERE `tbl_borrowers`.deleted = 0 AND `tbl_loanledger`.deleted = 0 AND MONTH ( `tbl_loanledger`.date_created) = MONTH(CURRENT_DATE)
        GROUP BY `tbl_loanledger`.borrower_id 
        ORDER BY `tbl_borrowers`.last_name";

预期结果将在贷款分类账和贷款账户中输出借款人当月(六月)的最后一笔交易。就像 Ben Cork 不在贷款分类账上一样，他在贷款账户上，但我想将他输出到结果集上。已删除的列表示如果为 0 则表示该列处于事件状态，如果为 0 则表示已被删除。

预期结果:

|First Name | Last Name |   Due Date   |    Balance     |
|    Ben    |    Cork   |  2017/06/16  |      50        |
|    Joe    |    Smith  |  2017/06/13  |      50        |
|    Lily   |     Mag   |  2017/06/08  |      350       |
|    Zen    |    Green  |  2017/06/15  |      150       |

Answer 1

尝试以下操作；)

select 
    tb.first_name, tb.last_name, coalesce(tlm.Loan, 0) as Loan, coalesce(t.`Amount Paid`, 0) as `Last Amount Paid`
from tbl_borrowers tb
left join tbl_loan_master tlm
on tb.id = tlm.borrowers_id
left join (
    select t1.*
    from tbl_loanledger t1
    inner join (
        select max(id) as id
        from tbl_loanledger
        group by borrowers_id, loanmaster_id
    ) t2 on t1.id = t2.id
) t
on tb.id = t.borrowers_id
and tlm.id = t.loanmaster_id

SQLFiddle DEMO HERE