Create After Insert Trigger in SQL

Create a Trigger is a special kind of stored procedure, that fires when we perform modification on the specific data on the specified table.

Create After Insert Trigger in SQL

Create After Insert Trigger in SQL

     

Create a Trigger is a special kind of stored procedure, that fires when we perform modification on the specific data on the specified table.

Understand with Example

The Tutorial illustrate a example from 'Create After Insert Trigger in SQL'. In this Example, we create a table 'Stu_Table' and 'Stu_Log' using create table statement.

Create Table Stu_Table

Create Table Stu_Table( Stu_Id int, Stu_Name varchar(15),Stu_Class int);

Create Table Stu_Log

create table stu_log( user_id VARCHAR(15), description VARCHAR(100));

Here is the video tutorial of: "How to create insert after trigger in MySQL?"

Create Trigger Stu_Insert

The Query create a  trigger stu_insert on table 'stu_table'. Whenever we perform insert values into a table 'stu_table', an insert trigger is fired and performed for each rows in the table. Once the trigger operation is performed ,this will run the query inside the begin-end statement. The insert into add the records or rows value to the table stu_log.

delimiter $$
      CREATE TRIGGER stu_insert
      AFTER insert ON stu_table FOR EACH ROW
BEGIN

	INSERT into stu_log(user_id, description)
        VALUES (user(), CONCAT('Insert Student record ',
	new.stu_id,' ',new.stu_name,' ',new.stu_class));

END$$
delimiter ;

Insert Data Into Stu_Table

insert into stu_table values(1, 'Komal',10);
insert into stu_table values(2, 'Ajay',10);
insert into stu_table values(3, 'Santosh',10);
insert into stu_table values(4, 'Rakesh',10);
insert into stu_table values(5, 'Bhau',10);

Stu_Table

+--------+----------+-----------+
| Stu_Id | Stu_Name | Stu_Class |
+--------+----------+-----------+
| 1      | Komal    | 10        |
| 2      | Ajay     | 10        |
| 3      | Santosh  | 10        |
| 4      | Rakesh   | 10        |
| 5      | Bhau     | 10        |
+--------+----------+-----------+

Stu_Log

+----------------+------------------------------------+
| user_id        | description                        |
+----------------+------------------------------------+
| [email protected] | Insert Student record 1 Komal 10   |
| [email protected] | Insert Student record 2 Ajay 10    |
| [email protected] | Insert Student record 3 Santosh 10 |
| [email protected] | Insert Student record 4 Rakesh 10  |
| [email protected] | Insert Student record 5 Bhau 10    |
+----------------+------------------------------------+