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What is database Trigger?
A database trigger is a PL/SQL block that can explained to automatically execute for insert, update, and delete statements against a table. The trigger can e defined to execute once for the entire statement or once for each row that is inserted, updated, or deleted. For any one table, there are twelve events for which you can explain database triggers. A database trigger can call database procedures that are also written in PL/SQL.
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
Why older data models are being replaced by new data modelling 100 words accepted#
Having Clause with sub queries: First we have to recollect the GROUP BYclause. The following query searches the minimum salary in every department. SELECT DEPTNO, MIN (SAL)
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
explain in details about one to one binary relationship
How to define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
What are stored and derived attributes? Stored attributes: The attributes keeps in a data base are known as stored attributes. Derived attributes: The attributes that are de
Explain Derived and Non-Derived Attribute? In few cases, two or more attribute values are related, for instance, Age and BirthDate attributes of a person. For specific person e
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