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What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
how to design tables
How can you terminate the MySQL Server? Typing the following in Command prompt will shut down the server completely as root user % mysqladmin -u root -p shutdown
What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
The primary key is selected from the
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
Define Deadlock avoidance These protocols as well ensure that the system will never enter a deadlock state although the way it is done is different from deadlock prevention. I
What is Derived and stored Attribute? Derived and Stored Attribute - In a few cases, two or more attribute values are associated, for example, Age and BirthDate attributes of a
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
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