Unlocking the Power of Triggers in SQL Server
- 1. Unlocking the Power of Triggers in SQL Server support@nareshit.com FOR MORE INFORMATION https://nareshit.com/courses/sql-server-online-training
- 2. Agenda Title Slide Introduction to Triggers Types of Triggers in SQL Server DDL Triggers How to Create a Trigger Logon Triggers DML Triggers Benefits & Drawbacks of Triggers Conclusion Trigger Example
- 3. Title Slide "Understanding Triggers in SQL Server" Sets the focus on explaining the concept of triggers in SQL Server. "A Comprehensive Overview" Indicates a detailed exploration of the topic. Your Name / Date: Add your name and the presentation date for professionalism. Example: John Doe | October 2, 2024. Design: Simple, professional background with bold fonts, and optionally a small database icon or SQL Server logo.
- 4. Introduction to Triggers Definition: A trigger is a special type of stored procedure that automatically executes when an event occurs in the database. Events: INSERT , UPDATE , DELETE Purpose: To enforce business rules, automate tasks, and maintain data integrity.
- 5. Types of Triggers in SQL Server 1. DML Triggers: Triggered by INSERT , UPDATE, or DELETE. 2. DDL Triggers: Triggered by CREATE, ALTER , DROP 3. Logon Triggers: Triggered by user logon events. Visual representation of the types.
- 6. DML Triggers AFTER Trigger: Fires after the operation INSERT , UPDATE , DELETE INSTEAD OF Trigger: Fires instead of the operation INSERT UPDATE DELETE Example use cases: Data validation, logging, cascading update
- 7. DDL Triggers Fires on changes: To schema objects like tables, views, stored procedures, etc. Use Case: Preventing schema changes or auditing them. Example: "Prevent a user from dropping a table." 03 https://nareshit.com/courses/sql-server-online-training
- 8. Logon Triggers Fires on user login attempts. Use Case: Restrict logins based on time, IP address, or security rules. Example: Blocking login attempts during maintenance windows. https://nareshit.com/courses/sql-server-online-training
- 9. How to Create a Trigger CREATE TRIGGER trigger_name ON table_name AFTER INSERT, UPDATE,DELETE AS BEGIN -- Your SQL code here END Example of a simple AFTER INSERT trigger. Syntax
- 10. CREATE TRIGGER trg_AfterInsert ON Customers AFTER INSERT AS BEGIN -- INSERT INTO CustomerLog (CustomerID, LogDate) SELECT CustomerID, GETDATE() FROM inserted; END Trigger Example Walk through the code and explain each part. Scenario: Log changes in a Customers table
- 11. Benefits & Drawbacks of Triggers Benefits: Automates repetitive tasks. Enforces complex business rules. Maintains data integrity. Drawbacks: Hidden logic, making debugging difficult. Performance overhead if overused. Potential for unintended consequences.
- 12. Conclusion Summary: Triggers are powerful for automating tasks and enforcing data rules. They should be used carefully to avoid performance issues. Best Practice: Keep triggers simple and well-documented. https://nareshit.com/courses/sql-server-online-training
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