WISDOMBYDATA
  • BLOG
    • Blog Guide
    • Blog History
  • EXCEL
    • Functions & Formulas
    • VBA & Macros
    • VLOOKUP
    • Pivot Tables
    • Conditional Formatting
    • Tricks & Shortcuts
  • BI
    • SAP BOBJ/BW
    • Tableau
  • SQL
  • ABOUT
    • About WBD
    • About Me

Using DDL Triggers in Microsoft SQL Server

10/27/2014

0 Comments

 
In this blog post I want to illustrate how you could use a DDL (Data Definition Language) trigger in order to prevent database users from dropping or altering tables in a database. I will use the AdventureWorks database for this example.

STEP 1]  Ensure that the AdventureWorks database is being used.


Picture
STEP 2] Use the transact SQL code similar to the one shown below in order to create a trigger. I named the trigger “NoALTERorDROP”! The objective for creating this trigger is to prevent users from altering and/or dropping tables and to send out a message every time a user attempts to do so. Note that the ROLLBACK command is the part of the code that prevents the action (I.e. altering or dropping) from happening.

CREATE TRIGGER NoALTERorDROP
       ON DATABASE
       FOR ALTER_TABLE, DROP_TABLE
AS
PRINT 'You do not have permission to alter or drop this table.'
ROLLBACK
GO
Step 3] In order to test the functionality of this trigger, I will create a table and then try to drop it (You could use an already existing table as well if you wish). I will name the table “Example”.

CREATE TABLE dbo.Example
(ID int) 
GO  

Step 4] Now let’s attempt to drop (or alter) the table to see whether the trigger actually works. As could be observed in the screenshot below, upon executing the drop table command the trigger did not permit the action from being committed and our customized message appeared in the Messages screen.
Picture

0 Comments
<<Previous

    Categories

    All
    BI
    EXCEL
    MISC
    SQL

    Archives

    June 2020
    May 2020
    April 2020
    March 2020
    February 2020
    December 2019
    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016
    June 2016
    May 2016
    April 2016
    March 2016
    February 2016
    May 2015
    April 2015
    March 2015
    February 2015
    January 2015
    December 2014
    November 2014
    October 2014
    September 2014
    August 2014
    April 2014
    March 2014
    February 2014
    January 2014
    December 2013
    November 2013

Powered by Create your own unique website with customizable templates.
  • BLOG
    • Blog Guide
    • Blog History
  • EXCEL
    • Functions & Formulas
    • VBA & Macros
    • VLOOKUP
    • Pivot Tables
    • Conditional Formatting
    • Tricks & Shortcuts
  • BI
    • SAP BOBJ/BW
    • Tableau
  • SQL
  • ABOUT
    • About WBD
    • About Me