Question: Can A Trigger Written For A View *?

What triggered?

Triggers are anything that remind someone of previous trauma.

To be triggered is to have an intense emotional or physical reaction, such as a panic attack, after encountering a trigger..

What are the different types of triggers?

Types of TriggersData Manipulation Language (DML) Triggers. DML triggers are executed when a DML operation like INSERT, UPDATE OR DELETE is fired on a Table or View. … Data Definition Language (DDL) Triggers. … LOGON Triggers. … CLR Triggers.

What are common triggers?

Some examples of common triggers are:the anniversary dates of losses or trauma.frightening news events.too much to do, feeling overwhelmed.family friction.the end of a relationship.spending too much time alone.being judged, criticized, teased, or put down.financial problems, getting a big bill.More items…

What is trigger and its types?

Triggers are database object. Basically, these are a special type of stored procedure that is automatically fired/executed when a DDL or DML command statement related to the trigger is executed. Triggers are used to assess/evaluate data before or after data modification using DDL and DML statements.

What is the use of triggers?

What is a Trigger? Triggers are the SQL codes that are automatically executed in response to certain events on a particular table. These are used to maintain the integrity of the data. A trigger in SQL works similar to a real-world trigger.

What are the after triggers *?

1. AFTER Triggers. AFTER Triggers are executed after the DML statement completes but before it is committed to the database. AFTER Triggers if required can rollback it’s actions and source DML statement which invoked it.

What is trigger with example?

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.

What Cannot be done on a view?

What cannot be done on a view? Explanation: In MySQL, ‘Views’ act as virtual tables. It is not possible to create indexes on a view. However, they can be used for the views that are processed using the merge algorithm.

Can we have triggers on views?

Triggers may be created on views, as well as ordinary tables, by specifying INSTEAD OF in the CREATE TRIGGER statement. If one or more ON INSERT, ON DELETE or ON UPDATE triggers are defined on a view, then it is not an error to execute an INSERT, DELETE or UPDATE statement on the view, respectively.

What is instead of triggers?

What is an INSTEAD OF trigger. An INSTEAD OF trigger is a trigger that allows you to skip an INSERT , DELETE , or UPDATE statement to a table or a view and execute other statements defined in the trigger instead. … In other words, an INSTEAD OF trigger skips a DML statement and execute other statements.

Which statement is used to remove a trigger?

DROP TRIGGER statementWhich statement is used to remove a trigger? Explanation: In order to delete a trigger, the DROP TRIGGER statement is used.

How triggers can be declared *?

Triggers can be defined as row triggers or statement triggers. Statement triggers are fired once for each triggering statement regardless of the number of rows in a table affected by the triggering statement. For example if a DELETE statement deletes several rows from a table, a statement trigger is only fired once.

What are triggers and views in SQL?

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.