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What is triggers in SQL Server with example?

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.
  • Data definition language (DDL) triggers which fire in response to CREATE , ALTER , and DROP statements.

Also, what are triggers in SQL Server?

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. DML events are INSERT, UPDATE, or DELETE statements on a table or view.

Similarly, what are the types of trigger in SQL Server? In SQL Server we can create four types of triggers Data Definition Language (DDL) triggers, Data Manipulation Language (DML) triggers, CLR triggers, and Logon triggers.

Similarly, you may ask, what is triggers in SQL with example?

SQL Trigger | Student Database. Trigger: A trigger is a stored procedure in database which 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 certain table columns are being updated.

How do I create a trigger in SQL Server?

Using SQL Server Management Studio In Object Explorer, connect to an instance of Database Engine and then expand that instance. Expand Databases, expand the AdventureWorks2012 database, expand Tables and then expand the table Purchasing. PurchaseOrderHeader. Right-click Triggers, and then select New Trigger.

Similar Question and The Answer

Why are triggers used?

Triggers are used to maintain the referential integrity of data by changing the data in a systematic fashion. Each trigger is attached to a single, specified table in the database. Triggers can be viewed as similar to stored procedures in that both consist of procedural logic that is stored at the database level.

What is the main purpose of triggers in 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 can I see all triggers in SQL Server?

To view database level triggers, Login to the server using SQL Server management studio and navigate to the database. Expand the database and navigate to Programmability -> Database Triggers. To view triggers at the server level, Login to Server using SSMS and navigate to Server Objects and then Triggers folder.

What is schema in SQL?

A schema in a SQL database is a collection of logical structures of data. From SQL Server 2005, a schema is an independent entity (container of objects) different from the user who creates that object. In other words, schemas are very similar to separate namespaces or containers that are used to store database objects.

What are views in SQL?

In SQL, a view is a virtual table based on the result-set of an SQL statement. The fields in a view are fields from one or more real tables in the database. You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table.

Where triggers are stored in SQL Server?

Triggers, like all objects, are stored within SQL Server in the database they were created in.

How do I test triggers in SQL?

To test Trigger, we need to execute the SQL query embedded in the trigger independently first and record the result. Then execute the trigger as whole and Compare the results. Triggers are useful for enforcing business rules, validating input data, and keeping an audit trail etc.

How can you tell if a trigger is fired in SQL Server?

To test if a trigger fires you can add a PRINT statement to the trigger (e.g. "PRINT 'trigger fired!' "), then do something that should trigger the trigger. If you get the printed text in your messages-tab in management studio you know it fired.

What are the types of triggers?

There are two types of triggers. BEFORE trigger: - This trigger is called before the execution of the DML statement. After Trigger: - this trigger is called after once DML statement is executed. Combination of triggers: - We can have combination of row, statement, BEFORE and AFTER triggers.

What is assertion in SQL?

An assertion is a statement in SQL that ensures a certain condition will always exist in the database. Assertions are like column and table constraints, except that they are specified separately from table definitions. However, assertions are checked only when UPDATE or INSERT actions are performed against the table.

Why do we create triggers in SQL?

Triggers are used to perform database actions when an event occurs. The event can occur as a DDL (Data Definition Language),Logon, a DML (Data Manipulation Language), CLR (Common Language Runtime) event.

What do u mean by trigger?

A trigger (from the Dutch trekken, meaning to pull) is a lever which, when pulled by the finger, releases the hammer on a firearm. In a database, a trigger is a set of Structured Query Language (SQL) statements that automatically "fires off" an action when a specific operation, such as changing data in a table, occurs.

What is meant by cursor in SQL?

A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor contains information on a select statement and the rows of data accessed by it. This temporary work area is used to store the data retrieved from the database, and manipulate this data.

How do I delete a trigger?

To delete a DML trigger 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.

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