Answer / kaarthi v

Triggers are the database objects (Like Procedures) which
will be executed by the Database itself and cannot be
excuted by the user explicitly. The trigger can be written
to execute while inserting/ updating/ deleting a row.

Two types of triiger

ROW LEVEL TRIGGER
===============
Row Level triggers are FOR EACH ROW, that is, the trigger
is activated for each row that is inserted/updated/deleted.

STATEMENT LEVEL TRIGGER
=====================
Statement level triggers will execute the action specified
only once. (Will not consider the no. of rows being
inserted/updated/deleted)

Answer / akn

Triggers are basically used to implement business rules.
Triggers are also similar to stored procedures.The
difference is that it can be activated when data is added
or edited or deleted from a table in a database.

Answer / jamuna

triggeres are databbase objects this are stored inthe
data base same as the procedures but procedures executed
explicitely byt triggers executed implicitely when
trigger event occures
triggere event means DML OPERATIONES (INSERT,UPDATE,DELETE)

Answer / sreekanth

Can anyone tell me in which scenarios row and statement lever can be used?

Answer / rocky-455

Triggers are validating data from COLUMNS/TABLE. It handles complex validations.

Answer / kamala k n

triggers types two row and statement

Answer / suresh

SQL> CREATE TABLE to_table
2 (col1 NUMBER);

Table created.

SQL> CREATE OR REPLACE TRIGGER statement_trigger
2 AFTER INSERT ON to_table
3 BEGIN
4 DBMS_OUTPUT.PUT_LINE('After Insert Statement
Level');
5 END;
6 /

Trigger created.

SQL> CREATE OR REPLACE TRIGGER row_trigger
2 AFTER INSERT ON to_table
3 FOR EACH ROW
4 BEGIN
5 DBMS_OUTPUT.PUT_LINE('After Insert Row Level');
6 END;
7 /

Trigger created.


SQL> INSERT INTO TO_TABLE VALUES(1);
After Insert Row Level
After Insert Statement Level

1 row created.


SQL> BEGIN
2 INSERT INTO TO_TABLE VALUES(2);
3 INSERT INTO TO_TABLE VALUES(3);
4 INSERT INTO TO_TABLE VALUES(4);
5 INSERT INTO TO_TABLE VALUES(5);
6 INSERT INTO TO_TABLE VALUES(6);
7 INSERT INTO TO_TABLE VALUES(7);
8 INSERT INTO TO_TABLE VALUES(8);
9 INSERT INTO TO_TABLE VALUES(9);
10 INSERT INTO TO_TABLE VALUES(0);
11 END;
12 /

WAT LL BE THE O/P???

XPLAIN IT>>>>

Using the relations and the rules set out in the notes under each relation, write table create statements for the relations EMPLOYEE, FIRE and DESPATCH. You should aim to provide each constraint with a formal name, for example table_column_pk.

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