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Explain the EXISTS and UNIQUE functions of SQL. Give an example for each?
EXISTS: The EXISTS function takes one parameter that is a SQL statement. If any records exist which match the criteria it returns true, or else it returns false. This provides you a clean, well-organized way to write a stored procedure in which does either an insert or update.
UNIQUE: If UNIQUE is particular then only unique values are used to compute the mean.
There are many simple and complex approaches to implement. These reports are based on some views or certain query. The following number of reports can be built. 1. The averag
explain equi-join using illustration
Task Partitioning, Sequencing and Project Planning The tasks required for the service might be broadly partitioned into: 0. Set up database tables and account file
object oriented database
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You are managing the following database system: • DBMS: Oracle 11g • OS: Sun Solaris • System architecture: Web-based application using ASP.Net • Purpose of Server: HR manage
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Identify the need and use of data control through problem solving, illustration
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