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What is trigger?
Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
difference between internal schema and external schema in DBMS
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
Meaningful use refers to the use of certified EHR technology to "enhance quality, efficiency, and reduce health disparities
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There are two major types of fragmentation: Horizontal& Vertical. Horizontal fragments, as the name suggests are subsets of tuples and vertical fragments are subsets of attributes
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
What Is Recovery? During the life of a transaction, i.e., a after the start of a transaction but before the transaction commits, various changes may be made in a database state
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