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Posted Date: 3/29/2013 9:16:37 AM | Location : USA
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Relational operations, Let us now talk about the relational operations: ...
Let us now talk about the relational operations: SELECT The select operation is used to select few specific record from the database based on different criteria, This is a un
Why dml is used for, Why DML is used for? DML is used to Manipulation and...
Why DML is used for? DML is used to Manipulation and processing of database. DML is provided for manipulation & processing of database. (Data stored in the database is processed
Cases of constraint violations, (1) Insert into PERSON Violated con...
(1) Insert into PERSON Violated constraint: - Key constraint Reason: - Primary key 1 already exists in PERSON. Dealing: - DBMS could ask the user to provide valid PER
How many types of views are there, How many types of Views are there? ...
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
Synonyms, Synonyms It allows short names or alternative names for objects....
Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:
Multiple column queries-syntax, Multiple column Queries: Syntax: ...
Multiple column Queries: Syntax: SELECT COLUMN1, COL2,...... FROM TABLE WHERE (COLUMN1, COL2, ...) IN (SELECT COLUMN1, COL2,.... FROM TABLE WHERE );
Determine the two special events, What are two special events? The two ...
What are two special events? The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered v
Although how will the system recover, Although how will the system recover ...
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
Functional dependencies, 1. Staff (staffID --> availabilityID) 2. Servic...
1. Staff (staffID --> availabilityID) 2. Services (servicesID --> itemBasedID --> timedBasedID) 3. TimedBased (timedbasedID--> priceid) 4. Clients (clientId, serviceId-->
Strong entity set and weak entity set, Strong entity set and weak entity se...
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
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