Mysql - 创建 View 组合 2 个表但仅通过选择合并而不合并表

Question

在 MySQL 中，我有 2 个表，名为 table_rebate 和 table_bonus

table_rebate(有 3 个相同的列，2 个不同的列)

a_id     a_value           a_time
 1        1000      2018-05-05 10:25:15
 2        3000      2018-05-05 11:35:15

table_bonus(有 3 个相同的列，3 个不同的列)

b_id     b_value           b_time      
 01        500       2018-05-05 11:20:15
 02        700       2018-05-05 12:30:15

我需要为我的 PHP (CI) View 选择 3 个相同的列到 1 个表中。

Number    from       Values            Time
  1      Rebate       1000      2018-05-05 10:25:15
  2      Bonus         500      2018-05-05 11:20:15
  3      Bonus         700      2018-05-05 11:35:15
  4      Rebate       3000      2018-05-05 12:30:15

我该怎么做？不合并，但需要像合并表一样打印，可以按(a_time & b_time)升序排序。

EXPLAIN select (@rn := @rn + 1) as id, `from`, `values`, `time`
from ((select 'rebate' as `from`, a_value as `values`, a_time as `time`
       from table_rebate
      ) union all
      (select 'bonus' as `from`, b_value, b_time
       from table_bonus
      ) 
     ) br cross join
     (select @rn := 0) params
order by `time`;

Answer 1

你可以使用union all:

select (@rn := @rn + 1) as id, `from`, `values`, `time`
from ((select 'rebate' as `from`, a_value as `values`, a_time as `time`
       from table_rebate
      ) union all
      (select 'bonus' as `from`, b_value, b_time
       from table_bonus
      ) 
     ) br cross join
     (select @rn := 0) params
order by `time`;

请注意，from、values 和time 都是SQL 中的关键字(即使没有保留)。这使它们成为非常糟糕的列名称。