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What are the three classes of SQL expression?
SQL expression consists of three clauses:
Select
From
Where
What is an ER diagram? Why is it used in Database management system (DBMS)?
A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe
Two-way Associations Mostly, associations are travel in both directions, although not usually with same frequency. There are three approaches for the implementation. In
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
The database will enable college administrators the ability to track students initial major. This will help college officials decide how best to prepare students for their goals an
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
Explain Thomas' Write rule. Show how it is different from timestamp ordering protol Ans: In timestamp-based concurrency control the thomas Write rule is a rule. Given a Timest
What is the role of a database administrator?
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
Consider the relations described below: PHYSICIAN (regno, name, telno, city) PATIENT (pname, street, city) VISIT (pname, regno, date_of_visit, fee) Where the regno and pname ide
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