PHP Course For Beginners > MY SQL with PHP

MySQL Trigger

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A trigger in MySQL is a stored programme that is run automatically in reaction to an event in the related table, such as an insert, update, or deletion. For example, before a new row is entered into a table, you can set a trigger that is automatically triggered.

In MySQL, a trigger is a collection of SQL statements stored in a system catalogue. It's a form of stored procedure that gets called automatically when something happens. Each trigger is tied to a specific table and is triggered by any DML statement like INSERT, UPDATE, or DELETE.

Any complicated data integrity rule needs to have triggers. You can't enforce this elsewhere but the database, otherwise you'll have data integrity issues. Unless you don't want to capture all database changes, they're also the best spot for auditing (which is the problem of auditing from the application).

A trigger is a sort of stored procedure that executes automatically when a database server event occurs. When a user attempts to edit data via a data manipulation language (DML) event, DML triggers are triggered. INSERT, UPDATE, and DELETE statements on a table or view are DML events.

A MySQL table can have up to SIX triggers.

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Course Content

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  2. Understanding SDLC Process
    13m 58s
  3. How to use LearnVern
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  4. Client Server Architecture
    5m 18s
  5. How to set up PHP Environment?
    18m 6s

  1. What is Data
    8m 57s
  2. What is Database
    3m 25s
  3. What is DBMS
    14m 25s
  4. SQL Queries and its types
    16m 57s
  5. Data Types in SQL - from 16
    22m 41s
  6. SQL constraints
    10m 52s
  7. Create, Drop & Show Database
    13m 40s
  8. SQL Create Table
    13m 53s
  9. SQL Insert & Select Statement
    26m 56s
  10. Operators in SQL
    6m 47s
  11. In & NOt in Condition
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  12. Null & Not Null Condition
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  13. Clauses in SQL
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  14. Understanding Having, Distinct & Group by
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  15. Update & Delete in SQL
    12m
  16. Alter table command in SQL
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  17. MySQL Rename truncate Drop
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  18. Understanding Foreign key
    15m 37s
  19. MySQL joins
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  20. MySQL views
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  21. MySQL Function
    21m 39s
  22. MySQL Procedure
    15m 33s
  23. MySQL Trigger
    16m 15s
  24. Normalization
    16m 9s
  25. Assignment : MYSQL
    8m 56s

  1. Understanding HTTP Methods
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  1. Understanding PHP Program structure Comments in PHP
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  1. Variables in PHP
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  1. Arithmetic & Assignment Operators in PHP
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  2. Comparison & Logical Operators in PHP
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  3. Ternary Operator in PHP
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  4. Assignment : Operators
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  3. $_FILES & $_ENV in PHP
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  3. Assignment : Array
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  2. More examples on Loops in PHP
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  1. Header Function in PHP
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  2. Assignment : Header Functions
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  2. Assignment : Date Time Functions
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  1. Include & Require Statement in PHP
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  1. Error Handling in PHP
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  1. File Upload in PHP
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  1. Database Connection in PHP Part 1
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  2. Database Connection in PHP Part 2
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  1. SQL Injection in PHP
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  1. Crud - Registration and DB connection Part 1
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  2. Crud - Registration and DB connection Part 2
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  3. Log in Operation
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  4. Read Operation
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  5. Update Operation Part 1
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  6. Update Operation Part 2
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  7. Log out Operation
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  1. MySQL Interview Question 1
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  2. MySQL Interview Question 2
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  3. MySQL Interview Question 3
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