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Define Aggregate functions and what aggregate functions supported by the MySQL
To calculate a summary value from a set of individual values and uses one of the functions known as aggregate functions.
These are so called for the reason that they operate on aggregates (groups) of values.
Aggregate functions include COUNT ( ) which counts records or values in a query result; MAX( ) and MIN( ) which find largest and smallest values; SUM( ) and AVG( )and which produce sums and means of values.
Complexity : A distributed DBMS that is available, reliable, and secure is inherently more difficult than a centralised DBMS. Though, adequate data replication is essential to have
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Question: The following relational database schema corresponds to a part of a database used by the Registry Department of a university. DEPARTMENT (d#, d-name, head-of-dept)
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Project Description: Oracle Certified Professional with 20 years of practice, Oracle version 6.0.34, 7.3, 8.0, 8i, 9i, 10G, 11G, 12C. Crossplatform migration, Informix, MSSql
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