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What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
Replicating Data One approach that may support efficient access to dissimilar applications as above may be to give access to every of the applications from dissimilar replicate
average response time?
List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
Where does view definition stored? A view definition is permanently stored as part of the database.
what are the states of transaction?
What is meant by Physical blocks? The input and output operations are completed in block units. The blocks residing on the disk are referred to as physical blocks.
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
Differentiate between a subquery and a join If we need to acquire information from one or more tables after that either subquery or join can be used. If the columns which are t
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