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Define instance and schema?
Instance: Collection of data stored in the data base at a certain moment is
Schema: The overall design of the data base is known as the data base schema.
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
Question 1 Discuss about second normal form and third normal form Question 2 Write short note on 1) Data Manipulation Language 2) Data Definition La
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Explain P command in the respect of QBE? P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is writ
What is Relational calculus? Relational calculus is a Non- Procedural language.
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Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
List any two disadvantages of a database system ? The disadvantages of database system are: • Database systems are difficult, complex, and time-consuming to design. • Substanti
define lock conversion
Describe the iterative and incremental life cycle For an iterative and incremental life cycle, two criteria are process and time. The main components of showing a project devel
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