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Explain controlled redundancy?
Controlled redundancy : The replication of data within the data warehouse for the purposes of improved data access or understand ability.
Compute the closure (F+) for the following set of the functional dependencies defined on R(a,b,c,d), where F - {c→ a, ab → d, a → b, d → c}, i.e. what are all of the FDs implied b
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Normal 0 false false false EN-US X-NONE X-NONE
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
What is MySQL? MySQL is a relational database management system which has eleven million installations. It can be used for both Linux and Window. Managing database includes add
Create a view emp_dep containing e_name and number of dependents from the tables employee and dependent of (i) CREATE VIEW emp_dept AS SELECT ename, COUNT(*) FROM employee, dep
What are the two types of indices? The two types of indices are:- A) Dense index B) Sparse index
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
What is the full form of DDL? DDL is stand for Data Definition Language.
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