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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  1. Introduction to PHP
    10m 23s
  2. Understanding SDLC Process
    13m 58s
  3. How to use LearnVern
    3m 20s
  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
    7m 4s
  12. Null & Not Null Condition
    4m 55s
  13. Clauses in SQL
    9m 46s
  14. Understanding Having, Distinct & Group by
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  15. Update & Delete in SQL
    12m
  16. Alter table command in SQL
    15m 29s
  17. MySQL Rename truncate Drop
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  18. Understanding Foreign key
    15m 37s
  19. MySQL joins
    22m 56s
  20. MySQL views
    18m 23s
  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
    33m 26s

  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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  1. Super Global Variable in PHP
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  2. GET & POST Variable in PHP
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  3. $_FILES & $_ENV in PHP
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  4. Assignment : Super Global Variables
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  2. switch case in PHP
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  3. Assignment : Conditional Statements
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  1. Functions in PHP
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  2. Call by value vs Call by reference in PHP
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  1. Array Functions in PHP
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  2. Array in PHP
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  3. Assignment : Array
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  1. String and its Functions in PHP
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  2. Assignment : String
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  1. Loops in PHP
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  2. More examples on Loops in PHP
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  3. Assignment : Loops
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  1. Header Function in PHP
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  2. Assignment : Header Functions
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  1. Date and Time functions in PHP
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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
    29m 17s
  2. Database Connection in PHP Part 2
    32m

  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
    24m 2s
  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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