How can I merge two MySQL tables?

To merge two MySQL tables, use the following syntax −

INSERT IGNORE INTO yourTableName1 select *from yourTableName2;

We will create two tables with some records. After that the merge process will begin using the above syntax.

Creating first table −

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

Inserting records into the table −

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

Displaying records from the table

mysql> select *from MergeDemo1;

The following is the output of the first table −

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

Let us now create second table −

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

Inserting records in the second table −

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

Displaying all records from second table −

mysql> select *from MergeDemo2;

The following is the output of the second table −

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

The following is the query to merge two tables.

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

Now, let us check whether the second table data is merged or not with the help of select statement. The query is as follows −

mysql> select *from MergeDemo1;

Here is the output that displays the merged table −

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