Triggers sql examples update

Below is an example of an After Delete Trigger. Whenever a row is delete in the Customers Table, the following trigger will be executed. The following Trigger is fetching the CustomerId of the deleted record and the fetched value is inserted in the CustomerLogs table.

The following screenshot displays the Log table after the above Triggers were executed. Instead Of Triggers. Below is an example of an Instead Of Delete Trigger. Whenever anyone tries to delete a row from the Customers table the following trigger is executed. Inside the Trigger, I have added a condition that if record has CustomerId value 2 then such a record must not be deleted and an error must be raised.

Also a record is inserted in the CustomerLogs table. If the CustomerId value is not 2 then a delete query is executed which deletes the record permanently and a record is inserted in the CustomerLogs table. The following error message shown when record with CustomerId 2 is deleted.

The following screenshot displays the Log table after the Instead Of Trigger is executed. Related Articles. Add Comments. Thank you for the feedback. The comment is now awaiting moderation. You will be notified via email when the author replies to your comment. Please select a comment to reply. You can add your comment about this article using the form below. Make sure you provide a valid email address else you won't be notified when the author replies to your comment Please note that all comments are moderated and will be deleted if they are Not relavant to the article Spam Advertising campaigns or links to other sites Abusive content.

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So after the update actually makes use of both inserted and deleted tables and inserted tables contain the new data, the deleted table contains the old data before the update action. I'm a software engineer, having good experience in software programming web designing with great command on ASP.

Also have great experience in Electronics and electrical engineers design. I like to do RND and Research. Save my name, email, and website in this browser for the next time I comment. In this post, We will discuss the difference between where and having clauses in SQL server with the examples. Here is the SQL script to create and populate with test data This is the continuation of the previous post So please read the below post.

So what does except operator do? Your Header Sidebar area is currently empty. Hurry up and add some widgets.