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Aggregate Functions and Grouping/Lecture 4 Assistant Lecturer Huda A. Alameen hudaa.alameen@uokufa.edu.iq
Additional Relational Operations: Aggregate Functions and Grouping  A type of request that cannot be expressed in the basic relational algebra is to specify mathematical aggregate functions on collections of values from the database.  Examples of such functions include retrieving the average or total salary of all employees or the total number of employee tuples. These functions are used in simple statistical queries that summarize information from the database tuples.  Common functions applied to collections of numeric values include SUM, AVERAGE, MAXIMUM, and MINIMUM.  The COUNT function is used for counting tuples or values.
Aggregate Function Operation
Using Grouping with Aggregation
Examples of applying aggregate functions and grouping DNO ℱCOUNT SSN, AVERAGE Salary (EMPLOYEE)
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Agg fun

  • 1. Aggregate Functions and Grouping/Lecture 4 Assistant Lecturer Huda A. Alameen hudaa.alameen@uokufa.edu.iq
  • 2. Additional Relational Operations: Aggregate Functions and Grouping  A type of request that cannot be expressed in the basic relational algebra is to specify mathematical aggregate functions on collections of values from the database.  Examples of such functions include retrieving the average or total salary of all employees or the total number of employee tuples. These functions are used in simple statistical queries that summarize information from the database tuples.  Common functions applied to collections of numeric values include SUM, AVERAGE, MAXIMUM, and MINIMUM.  The COUNT function is used for counting tuples or values.
  • 4. Using Grouping with Aggregation
  • 5. Examples of applying aggregate functions and grouping DNO ℱCOUNT SSN, AVERAGE Salary (EMPLOYEE)