What are triggers commonly used for in a database?
A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database.
How do I add a trigger to a database?
First, specify the name of the trigger that you want to create after the CREATE TRIGGER keywords. Note that the trigger name must be unique within a database. Next, specify the trigger action time which can be either BEFORE or AFTER which indicates that the trigger is invoked before or after each row is modified.
What is the maximum number of triggers you can apply on a single table?
What is the maximum number of Triggers can be applied in a table ? Explanation: We can apply at max of 12 triggers in a table.
Why are triggers a bad idea?
The difficulty with a trigger is that it does stuff “behind your back”; the developer maintaining the application could easily not realise it’s there and make changes which screw things up without even noticing. It creates a layer of complexity which just adds maintenance work.
How to drop a trigger in SQL Server?
The SQL Server DROP TRIGGER statement drops one or more triggers from the database. The following illustrates the syntax of the DROP TRIGGER statement that removes DML triggers: DROP TRIGGER [ IF EXISTS ] [schema_name.]trigger_name …n ]; Code language: SQL (Structured Query Language) (sql)
How to drop a trigger defined with database scope?
To drop a DDL trigger defined with server scope (ON ALL SERVER) or a logon trigger requires CONTROL SERVER permission in the server. To drop a DDL trigger defined with database scope (ON DATABASE) requires ALTER ANY DATABASE DDL TRIGGER permission in the current database.
When did SQL Server add the create trigger statement?
Something I want to note is the fact that the [OR ALTER] portion of the CREATE TRIGGER statement was added in SQL Server 2016 so it won’t work in earlier versions.
Can a DML trigger be used instead of a SQL statement?
Specifies that the DML trigger launches instead of the triggering SQL statement, thus, overriding the actions of the triggering statements. You can’t specify INSTEAD OF for DDL or logon triggers. At most, you can define one INSTEAD OF trigger per INSERT, UPDATE, or DELETE statement on a table or view.