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Q.1 Briefly discuss the different layers of ANSI SPARC architecture. Ans: The three layers of ANSI SPARC architecture are like this: 1. Internal view is at the lowest leve
what is cascading? what is rollback cascading? please explain in detail
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
If the deletion violates referential integrity constraint, then three alternatives are available: Default option: - refuse the deletion. It is the job of the DBMS to describ
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
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
Having Clause with sub queries: First we have to recollect the GROUP BYclause. The following query searches the minimum salary in every department. SELECT DEPTNO, MIN (SAL)
Define reference file
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
what is Nested relational model? Explain with examples.
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