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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.
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by
Consider the subsequent relations along with keys underlined Street (name, location, city) House (number, street_name) Lives (name, house_number) Define the above relations
Question: This form represents one of a number used for each sailing of a range of boats. A passenger may go on many sailings and will have the same passenger number for each.
Determine the Advanced modeling concepts You have to follow some steps for object-oriented design. These steps for OO Design methodology are as follow: 1) Produce objec
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#questiontypes of keys examples..
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
What is a candidate key? Minimal super keys are known as candidate keys.
Process of implementing system design in dynamic models There are three essential approaches to implementing system design in dynamic models. These approaches are as below:
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