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Jul 17, 2024 · Trigger is a statement that a system executes automatically when there is any modification to the database. In a trigger, we first specify when the trigger is to be executed and then the action to be performed when the trigger executes.
A Trigger in Structured Query Language is a set of procedural statements which are executed automatically when there is any response to certain events on the particular table in the database. Triggers are used to protect the data integrity in the database.
Jun 6, 2024 · A trigger is a stored procedure in a database that automatically invokes whenever a special event in the database occurs. For example, a trigger can be invoked when a row is inserted into a specified table or when specific table columns are updated.
Aug 5, 2023 · Database triggers are types of stored procedures that run in response to an event occurring in a database. They are typically associated with changes made to a table's data, like insertions, updates, or deletions. Triggers are useful for maintaining the data integrity in the database.
When you issue an INSERT, UPDATE, or DELETE statement, the relational database management system (RDBMS) fires the corresponding trigger. In some RDMBS, a trigger is also invoked in the result of executing a statement that calls the INSERT , UPDATE , or DELETE statement.
There are three types of triggers in SQL Server. DML triggers are automatically fired when an INSERT, UPDATE or DELETE event occurs on a table. DDL triggers are automatically invoked when a CREATE, ALTER, or DROP event occurs in a database. It is fired in response to a server scoped or database scoped event.
BEFORE trigger: – This trigger is called before the execution of the DML statement. This BEFORE trigger can be used for some condition check or it can be used to alter the whole DML statement so that it cannot be executed on the table.
