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Describe Participation Constraints?
Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another entity through the relationship type. This constraint specifies the minimum number of relationship examples in which each entity can participate in. It is sometimes known as the minimum cardinality constraint. There are two kinds of participation constraints - total and partial.
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Define outer union operation of the relational algebra. Compute the outer union for the relations R and S given below. Outer Join - If there are any values in one tabl
how the string works as keyword?
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
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Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
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