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What is Trigger? Trigger: A database trigger is procedural code which is automatically executed in response to specific events on a particular table in a database. Triggers can
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
To do the division operation R1 ÷ R2, R2 should be a correct subset of R1. In the following example R1 have attributes A and B and R2 have only attribute B so R2 is a correct subse
What is known as sequential file organization? In the sequential file organization, the records are kept in sequential order, according to the value of a "search key" of every
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
What is foreign key? Foreign Key - Let there are two relations in tables R and S. Any candidate key of the relation R that is referred in the relation S is known as the forei
what do you mean by consistency in rdbms?
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
explain equi-join using illustration
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