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In an organisation various projects are undertaken. Each projects can employ one or more employees. Every employee can work on one or more projects. Each project is undertaken on the request of client. A client can request for various projects. Each project has only one client. A project could use a number of items and a item may be used through various projects. Draw an E-R diagram and convert it to a relational schema.
The relational schema has subsequent tables 1) Project (Pid, Pname) 2) Employee (Empid, Ename) 3) Client (Cno, Cname) 4) Item (I type, I name) 5) Use (Pid, I type) 6) Work (Pid, Empid) 7) Request (Pid, Cno)
What is relational model feature? A relational model feature is much more data independence than some other database models.
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
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Types of Data fragmentation
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
How can one distinguish among different kinds of parameters? Input parameters are used to pass data to subroutines. Output parameters are used to pass data from subrout
Why is database redesign necessary? Database redesign is essential for two reasons. First, redesign is essential both to fix mistakes made during the initial database design. S
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
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