如何合并两个 MySQL 表？

INSERT IGNORE INTO yourTableName1 select *from yourTableName2;

mysql> create table MergeDemo1
   -> (
   -> id int,
   -> primary key(id),
   -> Name varchar(200)
   -> );
Query OK, 0 rows affected (1.00 sec)

mysql> insert into MergeDemo1 values(1,'John');
Query OK, 1 row affected (0.21 sec)

mysql> select *from MergeDemo1;

+----+------+
| id | Name |
+----+------+
| 1  | John |
+----+------+
1 row in set (0.00 sec)

mysql> create table MergeDemo2
   -> (
   -> id int,
   -> primary key(id),
   -> Name varchar(200)
   -> );
Query OK, 0 rows affected (0.51 sec)

mysql> insert into MergeDemo2 values(2,'David');
Query OK, 1 row affected (0.18 sec)

mysql> select *from MergeDemo2;

+----+-------+
| id | Name  |
+----+-------+
| 2  | David |
+----+-------+
1 row in set (0.00 sec)

mysql> INSERT IGNORE
-> INTO MergeDemo1 select *from MergeDemo2;
Query OK, 1 row affected (0.19 sec)
Records: 1 Duplicates: 0 Warnings: 0

mysql> select *from MergeDemo1;

+----+-------+
| id | Name  |
+----+-------+
| 1  | John  |
| 2  | David |
+----+-------+
2 rows in set (0.00 sec)