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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.
In the trigger syntax, firstly, we have to define the name of the trigger after the CREATE TRIGGER keyword. After that, we have to define the BEFORE or AFTER keyword with anyone event. Then, we define the name of that table on which trigger is to occur.
Creates a DML, DDL, or logon trigger. A trigger is a special type of stored procedure that automatically runs when an event occurs in the database server. DML triggers run when a user tries to modify data through a data manipulation language (DML) event.
Mar 17, 2022 · 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.
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.
Trigger creation statement syntax. To create a trigger, you use the following statement: CREATE TRIGGER trigger_name [ BEFORE | AFTER] event ON table_name trigger_type. BEGIN -- trigger_logic END; Code language: SQL (Structured Query Language) (sql) Let’s examine the syntax in more detail:
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.22, “CREATE TRIGGER Statement”, and Section 15.1.34, “DROP TRIGGER Statement” . Here is a simple example that associates a trigger with a table, to activate for INSERT operations.
SQL Server triggers are special stored procedures that are executed automatically in response to the database object, database, and server events. SQL Server provides three type of triggers: Data manipulation language (DML) triggers which are invoked automatically in response to INSERT, UPDATE, and DELETE events against tables.
Mar 20, 2020 · The simplified SQL syntax to define the trigger is as follows. Most of the syntax should be self-explanatory. The main idea is to define: A set of {sql_statements} that shall be performed when the trigger is fired (defined by remaining parameters) We must define when the trigger is fired. That is what the part {FOR | AFTER | INSTEAD OF} does.
Syntax. The syntax for creating a SQL trigger in SQL Server database is as follows: CREATE TRIGGER [Trigger_Name] ON [Table_Name] [AFTER/INSTEAD OF] [Trigger_Event] . AS . BEGIN. [Trigger_Code] END. [Trigger_Name]: The name given to the trigger. [Table_Name]: The name of the table on which the trigger will be created.
