Write a note on aggregate functions in SQL and Views in SQL with examples Database Management Systems 10CS54 VTU notes 4 Marks Jun July2014 JuneJuly 2015

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Write a note on aggregate functions in SQL and Views in SQL with examples. Database Management Systems - 10CS54 VTU notes 4 Marks (Jun / July2014 & June/July 2015)

SQL and Views in SQL with examples. ?


By:anonymousguy7799

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AGGREGATE FUNCTIONS ( ) Functions such as SUM, COUNT, AVERAGE, MIN, MAX are often applied to sets of values or sets of tuples in database applications (R) 38 The grouping attributes are optional
Example 1: Retrieve the average salary of all employees (no grouping needed): 
(AVGSAL) (EMPLOYEE) 
Example 2: For each department, retrieve the department number, the number of employees, and the average salary (in the department): COUNT SSN, AVERAGE SALARY DNO is called the grouping attribute in the above example 
SQL Views In SQL, a view is a virtual table based on the result-set of an SQL statement. A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
 CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition SQL CREATE VIEW Examples CREATE VIEW [Current Product List] AS SELECT ProductID, ProductName FROM Products WHERE Discontinued=No

Nikhil-bharadwaj

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