Insert from one table with different structure to another in MySQL?

For this, use INSERT INTO SELECT statement. Let us first create a table −

mysql> create table DemoTable1
   -> (
   -> PersonId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> PersonName varchar(20),
   -> PersonAge int,
   -> PersonCountryName varchar(20)
   -> );
Query OK, 0 rows affected (0.55 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1(PersonName,PersonAge,PersonCountryName) values('Chris Brown',24,'US');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable1(PersonName,PersonAge,PersonCountryName) values('John Doe',26,'UK');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable1(PersonName,PersonAge,PersonCountryName) values('David Miller',23,'AUS');
Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1;

This will produce the following output −

+----------+--------------+-----------+-------------------+
| PersonId | PersonName   | PersonAge | PersonCountryName |
+----------+--------------+-----------+-------------------+
|        1 | Chris Brown  |        24 | US                |
|        2 | John Doe     |        26 | UK                |
|        3 | David Miller |        23 | AUS               |
+----------+--------------+-----------+-------------------+
3 rows in set (0.00 sec)

Here is the query to create second table −

mysql> create table DemoTable2
   -> (
   -> EmployeeId int,
   -> EmployeeFullName varchar(30),
   -> EmployeeAge int,
   -> EmployeeCountryName varchar(20),
   -> EmployeeSalary int default 20000
   -> );
Query OK, 0 rows affected (0.52 sec)

Here is the query to insert from one table with different structure to another −

mysql> insert into DemoTable2(EmployeeId,EmployeeFullName,EmployeeAge,EmployeeCountryName) select PersonId,PersonName,PersonAge,PersonCountryName from DemoTable1;
Query OK, 3 rows affected (0.26 sec)
Records: 3  Duplicates: 0  Warnings: 0

Display all records from the table using select statement −

mysql> select * from DemoTable1;

This will produce the following output −

+------------+------------------+-------------+---------------------+----------------+
| EmployeeId | EmployeeFullName | EmployeeAge | EmployeeCountryName | EmployeeSalary |
+------------+------------------+-------------+---------------------+----------------+
|          1 | Chris Brown      |          24 | US                  |          20000 |
|          2 | John Doe         |          26 | UK                  |          20000 |
|          3 | David Miller     |          23 | AUS                 |          20000 |
+------------+------------------+-------------+---------------------+----------------+
3 rows in set (0.00 sec)