合并具有不同列的两个表mysql [英] merge two tables with different columns mysql

问题描述

我想合并两个不同列的表 mysql.例如

I want to merge two tables with different columns mysql. For e.g.

表一:

-------------------------------------------------------------
item_id   title   slug   type   views   updatedAt   createdAt
-------------------------------------------------------------
 1    sometitle someslg  1     43454    timestamp   timestamp
 2    sometitle someslg  1     43566    timestamp   timestamp

表 2:

-------------------------------------------------------------
id    ptitle   slug     pviews   updatedAt   createdAt
-------------------------------------------------------------
 1  sometitle  someslg  3434    timestamp   timestamp
 2  sometitle  someslg  6454    timestamp   timestamp
 3  sometitle  someslg  5454    timestamp   timestamp

以上表格为示例.我已与 UNION 合并.这是我的查询

The above tables are examples. I have merged with UNION. Here is my query

SELECT * ((SELECT t1.item_id,t1.title,t1.slug,t1.type,t1.views,t1.updatedAt,t1.createdAt 
FROM table1
t1) UNION ALL (SELECT t2.id,t2.ptitle,t2.slug,'',t2.pviews,t2.updatedAt,t2.createdAt)) t3 
ORDER BY t3.item_id ASC

这工作正常执行查询后，我会得到类似的结果

This is working fine After Executing the query i will get the results like

-------------------------------------------------------------
item_id   title   slug   type   views   updatedAt   createdAt
-------------------------------------------------------------
 1    sometitle someslg  1     43454    timestamp   timestamp
 1    sometitle someslg        3434     timestamp   timestamp
 2    sometitle someslg  1     43566    timestamp   timestamp
 2    sometitle someslg        6454     timestamp   timestamp
 3    sometitle someslg        5454     timestamp   timestamp

但我希望结果中有一个虚拟列，显示如下表中的行

But i want a virtual column in the result that shows the row from which table as shown below

--------------------------------------------------------------------------
item_id   title   slug   type   views   updatedAt   createdAt   from_tbl
--------------------------------------------------------------------------
 1    sometitle someslg  1     43454    timestamp   timestamp   t1
 1    sometitle someslg        3434     timestamp   timestamp   t2
 2    sometitle someslg  1     43566    timestamp   timestamp   t1
 2    sometitle someslg        6454     timestamp   timestamp   t2
 3    sometitle someslg        5454     timestamp   timestamp   t2

推荐答案

只需将列添加到:

SELECT t3.*
FROM ((SELECT t1.item_id, t1.title, t1.slug, t1.type, t1.views, t1.updatedAt, t1.createdAt, 't1' as from_tbl
       FROM table1 t1
      ) UNION ALL
      (SELECT t2.id, t2.ptitle, t2.slug, '', t2.pviews, t2.updatedAt, t2.createdAt, 't2'
      )
     ) t3
ORDER BY t3.item_id ASC

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