Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / ranganath
In a DBMS, a trigger is a SQL procedure that initiates an
action (i.e., fires an action) when an event (INSERT,
DELETE or UPDATE) occurs. Since triggers are event-driven
specialized procedures, they are stored in and managed by
the DBMS. A trigger cannot be called or executed; the DBMS
automatically fires the trigger as a result of a data
modification to the associated table. 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. Stored procedures, however, are not event-
drive and are not attached to a specific table as triggers
are. Stored procedures are explicitly executed by invoking
a CALL to the procedure while triggers are implicitly
executed. In addition, triggers can also execute stored
procedures.
A trigger can also contain INSERT, UPDATE and DELETE logic
within itself, so when the trigger is fired because of data
modification it can also cause another data modification,
thereby firing another trigger. A trigger that contains
data modification logic within itself is called a nested
trigger.
| Is This Answer Correct ? | 20 Yes | 1 No |
Post New Answer View All Answers
How you can get a list of all the table constraints in a database? : Sql server administration
What are the advantages of having an index on the sql server?
How many databases Microsoft SQL server provides?
Can you get second highest salary from the table?
What is the stuff and how does it differ from the replace function?
Suppose you want to implement the following relationships while designing tables. How would you do it?a.) One-to-oneb.) One-to-manyc.) Many-to-many
What is an entity-relationship diagram (erd)?
What are the differences between clustered and non-clustered index?
How to create a dynamic cursor with the dynamic option?
what is a traditional network library for sql servers? : Sql server database administration
Explain how would you store your query in an SSRS report or a Database server?
How many columns can exist together per table?
How to create dbo table in sql server?
Explain the difference between cross join and full outer join?
What are the basic functions for master, msdb, model, tempdb and resource databases? : SQL Server Architecture
