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What is the use of unique function?
UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
Question: AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
A student entity type has the following attributes,name..
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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a need some real life examples of database management systems three level of ANSI SPARC architecture life teacher and student ,company and employee or for NGO etc.
Advantages of Database management system Let us summarize the advantages. Reduction of Redundancy: This is perhaps the most important advantage of using DBMS. Redundancy i
Lock Based Protocol A lock is nothing but a mechanism that tells the DBMS whether a particular data item is being used by any transaction for read/write purpose. As there are t
What is the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
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