Question: Which Prefixes Are Available To Oracle Triggers?

Under which circumstances do you design database triggers?

Under which two circumstances do you design database triggers.

(Choose two) To duplicate the functionality of other triggers.

To replicate built-in constraints in the Oracle server such as primary key and foreign key.

To guarantee that when a specific operation is performed, related actions are performed..

What are DML triggers?

DML triggers is a special type of stored procedure that automatically takes effect when a data manipulation language (DML) event takes place that affects the table or view defined in the trigger. DML events include INSERT, UPDATE, or DELETE statements.

What is implicit cursor?

A SQL (implicit) cursor is opened by the database to process each SQL statement that is not associated with an explicit cursor. Every SQL (implicit) cursor has six attributes, each of which returns useful information about the execution of a data manipulation statement.

Which prefixes are available to triggers?

Which prefixes are available to Oracle triggers?A. : new only.B. : old only.Both :new and :old.Neither :new nor :old.

What are the different in triggers?

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.

What are after triggers?

After triggers: used to access field values that are set by the system (such as a record’s Id or LastModifiedDate field) and to effect changes in other records. The records that fire the after the trigger is read-only. We cannot use After trigger if we want to update a record because it causes a read-only error.

What is the difference between after and before trigger?

Before triggers execute before the data has been committed into the database. … After triggers execute after the data has been inserted or updated in the database. Usually, after triggers are used because you need access to a formula field or the Id in the case of an insert.

Which statement is used to remove a trigger?

DROP TRIGGER statementUse the DROP TRIGGER statement to remove a database trigger from the database. The trigger must be in your own schema or you must have the DROP ANY TRIGGER system privilege. To drop a trigger on DATABASE in another user’s schema, you must also have the ADMINISTER DATABASE TRIGGER system privilege.

How can we specify a row level trigger?

Row-level trigger is identified by the FOR EACH ROW clause in the CREATE TRIGGER command. Statement-level triggers execute once for each transaction. For example, if a single transaction inserted 500 rows into the Customer table, then a statement-level trigger on that table would only be executed once.

What are the three parameter modes for procedures?

The three parameter modes, IN (the default), OUT , and IN OUT , can be used with any subprogram. However, avoid using the OUT and IN OUT modes with functions. The purpose of a function is to take no arguments and return a single value. It is poor programming practice to have a function return multiple values.

Which of the following is not an oracle supported trigger?

7. Which of the following is NOT an Oracle-supported trigger? Explanation: Example: During trigger is not possible in any database.

What is the maximum number of triggers that can apply to a single table?

You can hav many number of triggers in a table but the COMBINATIONS YOU CAN MAKE can be 12 only.

Which is the extension of an Oracle SQL Plus file?

By default, SQL*Plus saves the file to AFIEDT. BUF. You can specify a different file name in the editor.

For which of the following are triggers not supported?

For which of the following are triggers not supported? Explanation: In MySQL, the triggers are run only after the table modifications like insert, update and delete are run. Triggers are not supported for views. In order to create a trigger, the CREATE TRIGGER statement is used.

Which statement lets you create standalone functions that are stored in an Oracle database?

The SQL CREATE FUNCTION statement lets you create stored functions that are stored in an Oracle database. These stored (schema level) subprograms can be accessed from SQL. You can use the optional OR REPLACE clause to modify an existing function.

What are the two 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 are some emotional triggers?

Some more common emotional triggers:Someone rejecting you.Someone leaving you (or the threat that they will).Helplessness over painful situations.Someone discounting or ignoring you.Someone being unavailable to you.Someone giving you a disapproving look.Someone blaming or shaming you.More items…•