Implement MySQL trigger in the first table to insert records in the second table?

For this, the syntax is as follows −

DELIMITER //
create trigger yourTriggerName before insert on yourTableName1
   for each row
   begin
         insert into yourTableName2 values (yourValue1,yourValue2,...N);
end ;
//
DELIMITER ;

Let us first create a table −

mysql> create table DemoTable1
(
   StudentId int,
   StudentName varchar(40)
);
Query OK, 0 rows affected (0.69 sec)

Here is the query to create second table −

mysql> create table DemoTable2(
   Id int,
   Name varchar(40)
);
Query OK, 0 rows affected (0.61 sec)

Here is the query for trigger before insert −

mysql> DELIMITER //
mysql> create trigger afterinserttrigger before insert on DemoTable1 for each row
   begin
      insert into DemoTable2 values (10,'Chris');
   end ;
//
Query OK, 0 rows affected (0.13 sec)
mysql> DELIMITER ;

Let us insert the record into first table −

mysql> insert into DemoTable1 values(1,'David');
Query OK, 1 row affected (0.21 sec)

Now you can display all records from the first table using select statement −

mysql> select *from DemoTable1;

This will produce the following output −

+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
|         1 | David       |
+-----------+-------------+
1 row in set (0.00 sec)

Let us check the table records of second table −

mysql> select *from DemoTable2;

This will produce the following output −

+------+-------+
| Id   | Name  |
+------+-------+
|   10 | Chris |
+------+-------+
1 row in set (0.00 sec)

AmitDiwan

Published on 09-Oct-2019 16:03:15