mysql - 使用Mysql从不同名称的不同表中选择值作为贷方和借方并计算余额

Question

我需要从具有不同列名的不同表中获取值，并将其选择为可以进行余额计算的通用名称。类似这样的事情:

表 1(来源)

+-----------+--------------+---------------+
| ID_company|  date_table1 |  credit_table1|
+-----------+--------------+---------------+
|         1 |   2017-08-19 |            50 | 
|         1 |   2017-08-19 |           250 |
|         1 |   2017-08-20 |             0 |
+-----------+--------------+---------------+

表 2(来源)

+-----------+--------------+---------------+
| ID_company|  date_table2 |  credit_table2|
+-----------+--------------+---------------+
|         1 |   2017-08-19 |           150 | 
|         1 |   2017-08-19 |            50 |
|         1 |   2017-08-19 |             0 |
+-----------+--------------+---------------+

表3(借方)

+-----------+--------------+---------------+
| ID_company|  date_table3 |   debit_table3|
+-----------+--------------+---------------+
|         1 |   2017-08-19 |            10 | 
|         1 |   2017-08-19 |            10 |
|         1 |   2017-08-20 |             0 |
+-----------+--------------+---------------+

表4(借方)

+-----------+--------------+---------------+
| ID_company|  date_table4 |   debit_table4|
+-----------+--------------+---------------+
|         1 |   2017-08-19 |            10 | 
|         1 |   2017-08-19 |            10 |
|         1 |   2017-08-20 |             0 |
+-----------+--------------+---------------+

结果

+-----------+--------------+---------------+--------------+---------+
| ID_company|  date_grouped|   total_debit | total_credit | balance |
+-----------+--------------+---------------+--------------+---------+
|         1 |   2017-08-19 |            20 |          200 |     180 |
|         1 |   2017-08-19 |            20 |          300 |     280 | 
|         1 |   2017-08-20 |             0 |            0 |       0 |
+-----------+--------------+---------------+--------------+---------+

表之间的关系是 ID_company，但列名不同，我需要计算按日期分组的所有表的贷方、借方和余额。

Answer 1

我认为这应该有效，即使最多三个表中没有给定日期的条目。
余额是每天的，不是累计的。

它不会产生您的示例结果，但我认为您的示例中有错误。您真的需要两行 ID 1 和相同的日期吗？

SELECT 
    ID_company, 
    date_grouped, 
    sum(credit_table1) + sum(credit_table2) total_credits, 
    sum(debit_tabel3) + sum(debit_table4) total_debit, 
    sum(debit_tabel3) + sum(debit_table4)
        - (sum(credit_table1) + sum(credit_table2)) balance
FROM (
    SELECT 
        ID_Company, 
        date_table1 date_grouped, 
        credit_table1,
        0 credit_table2, 
        0 debit_table3, 
        0 debit_table4 
    FROM table1
    UNION
    SELECT 
        ID_Company, 
        date_table2 date_grouped, 
        0 credit_table1, 
        credit_table2,
        0 debit_table3, 
        0 debit_table4 
    FROM table2
    UNION
    SELECT 
        ID_Company, 
        date_table3 date_grouped, 
        0 credit_table1, 
        0 credit_table2, 
        debit_table3,
        0 debit_table4 
    FROM table3
    UNION
    SELECT 
        ID_Company, 
        date_table4 date_grouped, 
        0 credit_table1, 
        0 credit_table2, 
        0 debit_table3,
        debit_table4
    FROM table4  
)
GROUP BY ID_company, date_grouped