合並具有不同列的兩個表 mysql

Question

我想合並兩個具有不同列 mysql 的表。例如

表格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。 我已與UNION合並。 這是我的查詢

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

這工作正常執行查詢后我會得到類似的結果

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

但我想要結果中的虛擬列顯示來自哪個表的行，如下所示

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

試試這個方法

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

** LinkID1 和 LinkID2 一起是索引引用

Answer 4

這個 sql 腳本可以實現相同的目的，而無需執行指定整個列名列表的麻煩。 該腳本可以猜測匹配列名並在插入過程中刪除重復項。

SET @target_table = '`klame_new`.`url`';
SET @source_table = '`klame_url`.`url`';

SELECT GROUP_CONCAT(column_name)
 FROM INFORMATION_SCHEMA.COLUMNS a 
 WHERE a.TABLE_NAME = 'url'
 AND a.TABLE_SCHEMA = 'klame_url'
 AND a.COLUMN_NAME IN (
   SELECT b.COLUMN_NAME
   FROM INFORMATION_SCHEMA.COLUMNS b 
   WHERE b.TABLE_NAME = 'url'
   AND b.TABLE_SCHEMA = 'klame_new' 
 ) INTO @columns;

SET @s = CONCAT('REPLACE INTO ', @target_table , ' (', @columns ,') ' , ' SELECT ', @columns ,' FROM ', @target_table ,' UNION ALL SELECT ', @columns , ' FROM ', @source_table);

PREPARE stmt FROM @s;
EXECUTE stmt;