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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)
Determine the rule that a value of a foreign key should appear as a value of some particular table is called a Ans: Referential constraint. The rule that a value of a fo
An employee record has the following structure struct employee { int eno; char name[22]; float salary; char dept[10];}; (i) Calculate the record size R in bytes.
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Database Errors: An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or
Can we delete data element, which is being used by table fields. No we cant delete data element.
Cardinality shows the number of instances of an entity associated with another entity participating in a relationship. Depend on the cardinality binary relationship can be further
what is data link layer
What are wait-for-graphs?Give the algorithm to construct a wait-for-graph from a given schedule of transactions? How can deadlocks be detected from wait-for-graphs? Ans: The
Discuss the methods for a hash file to expand and shrink dynamically. What are the advantages and disadvantages of each? The hashing methods that permit dyanamic file expansi
What is a security? Securities are claims on financial assets. They can be illustrated as "claim checks" which give their owners the right to receive funds in the future. Sec
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