mysql分表后查询所有表中的记录

1，MySQL有一个MERGE存储引擎是专门做这个事情的，借这篇博文了解：Mysql MERGE引擎分表

2，使用union  因为表结构和字段类似就可以使用

(SELECT xx FROM table1 WHERE type=1) union
(SELECT xx FROM table1 WHERE type=1) union
(SELECT xx FROM table1 WHERE type=1) union
(SELECT xx FROM table1 WHERE type=1) 

SELECT xxx FROM (
    (SELECT xx FROM table1 WHERE type=1) union
    (SELECT xx FROM table1 WHERE type=1) union
    (SELECT xx FROM table1 WHERE type=1) union
    (SELECT xx FROM table1 WHERE type=1) 
) t WHERE t.xxx....