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What is the difference among a database schema and a database state?
The collection of information stored in database at particular moment in time is known as database state although the whole design of database is known as database schema.
Consider a database application that deals with an Employee relation with information such as SIN, name, data of birth (DOB), and DID (the ID of the department at which the employe
Describe multi key files
what is entity in database system?
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
WHAT IS SQL
explain various steps uses in evaluation and maintenance of MIS.
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
What is hashing file organization? In the hashing file organization, a hash function is computed on some attribute of every record. The result of the hash function specify in
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
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