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Why use triggers?

From: SQL Server: Triggers, Stored Procedures, and Functions

Video: Why use triggers?

Let's talk little bit about some of the advantages of using triggers. Triggers can be used to audit changes to the database. We can set up triggers on tables to record every change to every record in the table. Typically, this is accomplished by copying the record before it's modified to a different table. A table we might call historical data. Triggers can also be used to ensure the integrity of our data. SQL Server has some other ways to do this such as checks and constraints.

Why use triggers?

Let's talk little bit about some of the advantages of using triggers. Triggers can be used to audit changes to the database. We can set up triggers on tables to record every change to every record in the table. Typically, this is accomplished by copying the record before it's modified to a different table. A table we might call historical data. Triggers can also be used to ensure the integrity of our data. SQL Server has some other ways to do this such as checks and constraints.

But those are designed to be pretty simple. They check for a data type or they might check to make sure some value is greater than or less than some other value. Triggers allow for more robust logic. We can generate data integrity rules that implement complex business logic, that can reference multiple tables based on the value in those tables, decide if a certain piece of data is valid or invalid. Triggers can also be used to block mistakes. Triggers can undo an attempt to change data.

They can even undo an attempt to change the structure of the database. So something like dropping a table can be blocked by a trigger.

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This video is part of

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  1. 2m 15s
    1. Welcome
      51s
    2. What you should know
      51s
    3. Using the exercise files
      33s
  2. 11m 1s
    1. Comparing triggers, functions, and procedures
      3m 25s
    2. Why use a stored procedure?
      4m 59s
    3. Why use functions?
      1m 27s
    4. Why use triggers?
      1m 10s
  3. 6m 2s
    1. Configuring your environment
      4m 53s
    2. Downloading and installing a sample database
      1m 9s
  4. 26m 25s
    1. Creating a stored procedure
      2m 46s
    2. Modifying a stored procedure
      2m 34s
    3. Returning data using data sets
      3m 45s
    4. Returning data using cursors
      3m 45s
    5. Using input and output parameters
      5m 24s
    6. Using security and permissions
      5m 24s
    7. Using transactions
      2m 47s
  5. 11m 56s
    1. Creating a user-defined function
      4m 59s
    2. Exploring single-value functions
      4m 18s
    3. Exploring table value functions
      2m 39s
  6. 9m 31s
    1. Using "after" triggers
      3m 47s
    2. Using "instead of" triggers
      2m 9s
    3. Using nested triggers
      1m 38s
    4. Using database-level triggers
      1m 57s
  7. 12m 43s
    1. Exploring a real-world INSERT procedure
      5m 32s
    2. Exploring a real-world UPDATE procedure
      3m 13s
    3. Implementing logging on DELETE
      3m 58s
  8. 19m 38s
    1. Understanding the Common Language Runtime (CLR) and the .NET framework
      1m 52s
    2. Using CLR with SQL Server 2012
      4m 11s
    3. Writing stored procedures with C# .NET
      5m 51s
    4. Writing functions with .NET
      5m 7s
    5. Choosing between T-SQL vs. CLR
      2m 37s
  9. 11m 34s
    1. Creating a basic web form and connecting to a database
      2m 56s
    2. Executing a stored procedure
      2m 4s
    3. Passing parameters
      3m 41s
    4. Getting return values
      2m 53s
  10. 1m 43s
    1. Next steps
      1m 43s

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