Question

我想合并两个不同列mysql的表。例如，

表1：

-------------------------------------------------------------
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

上表是示例。我已与 UNION 合并。这是我的查询

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

这很好用在执行查询后我会得到像

这样的结果

-------------------------------------------------------------
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

但是我想在结果中显示一个虚拟列，显示下表所示的行

--------------------------------------------------------------------------
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

Answer 1

只需添加以下列：

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

Answer 2

试试这种方式

SELECT t3.*
FROM ((SELECT t1.item_id, t1.title, t1.slug, t1.type, t1.views, t1.updatedAt, t1.createdAt, '1' as from_tbl
       FROM table1 t1
      ) UNION ALL
      (SELECT t2.id, t2.ptitle, t2.slug, '', t2.pviews, t2.updatedAt, t2.createdAt, '2'  FROM table2 t2
      )
     ) t3
ORDER BY t3.item_id ASC

Answer 3

CREATE TABLE table3 AS（选择 t1。*，t2。* 从table1作为t1，从table2作为t2 哪里 t1.LinkID1 = t2.LinkID2 ）; 插入表3

** LinkID1和LinkID2一起都是索引引用

合并两个不同列的表mysql

3 个答案: