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What does a SQL UPDATE return?
Returns updated data or expressions based on it as part of the UPDATE operation. The OUTPUT clause is not supported in any DML statements that target remote tables or views. For more information about the arguments and behavior of this clause, see OUTPUT Clause (Transact-SQL).
How can I tell which columns were changed in a SQL Server UPDATE?
Using a SQL Server trigger to check if a column is updated, there are two ways this can be done; one is to use the function update() and the other is to use columns_updated().
How do triggers work in SQL servers?
The triggers in SQL Server (DML) fire on events irrespective to the number of rows affected. Below is the sample syntax for creating a DML trigger for update event. These triggers are created at the table level. Upon successful creation of trigger, we can see the triggers by navigating to Triggers folder at table level.
How do you delete trigger in SQL?
To delete a DML trigger In Object Explorer, connect to an instance of Database Engine and then expand that instance. Expand the database that you want, expand Tables, and then expand the table that contains the trigger that you want to delete. Expand Triggers, right-click the trigger to delete, and then click Delete.
What is a SQL Server trigger?
A SQL Server trigger is a piece of procedural code, like a stored procedure which is only executed when a given event happens. There are different types of events that can fire a trigger. Just to name you a few, the insertion of rows in a table, a change in a table structure and even a user logging into a SQL Server instance.
What is an example of a trigger in SQL?
A SQL trigger is a database object just like a stored procedure, or we can say it is a special kind of stored procedure which fires when an event occurs in a database. We can execute a SQL query that will “do something” in a database when an event is fired. For example, a trigger can be set on a record insert in a database table.