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Define- relational algebra.
The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relation as output.
A database is to be constructed to remain track of the teams and games of a sport league. A team has a number of players, not all of whom participate in every game. It is desired
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Define Query Processing Query processing is the process of selecting the best plan or strategy to be employed in responding to a database request. The plan is then executed to
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Consider the following frequency counts of some itemsets in a transaction database r : freq({A}, r) = 0.405 freq({B}, r) = 0.510 freq({C}, r) = 0.303 freq({A
aggregation
In the architecture of a database system which external level used? In the architecture of a database system view external level used.
Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require
sql is relationally complete-justify
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
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