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aggregatefunction-220420051702.pptx aggregate
- 2. SQL AGGREGATE FUNCTION SQL aggregation function is used to perform the calculation on multiple rows of a single column of a table. It returns a single value. It is also used to summarize the data. This function ignore the null values except the count function .
- 4. TYPES OF SQL AGGREGATION FUNCTION Count ( ) : Returns the numbers of rows Sum ( ) : Returns the sum Avg ( ) : Returns the average value Max ( ) : Returns the smallest value Min ( ) : Returns the largest value
- 5. COUNT FUNCTION Count function is used to count the number of rows in database table .It can work on both numeric and non-numeric data types. Count function uses the count (*) that returns the count of all the rows in a specific table. Count (*) considers duplicate and null . This function does not count the null value . Table name :Employee
- 6. EXAMPLE :TABLE NAME DATE PAGES RAMU 22022-01-12 34 GEETHA 22022-01-12 74 SEETHA 22022-01-12 64 RAM 22022-01-12 94 SUKRIA 22022-01-12 64
- 7. SYNTAX OF COUNT Syntax: select count(Pages) from employee; Count (pages) 5 1 row in set Syntax: select count (name) from employee; Count(name) 5 1 row in set
- 8. SUM FUNCTION Sum() function is an aggregate function that calculates the sum of all or distinct values in an expression . SYNTAX: SELECT SUM (PAGES) FROM EMPLOYEE; SUM(PAGES) 330 1 ROW IN A SET
- 9. AVERAGE FUNCTION The avg function is used to calculate the average value of the numeric type. Average function returns the average of all non-null values. syntax: select avg (pages)from employee; avg(pages) 66.0000 1row in set
- 10. MAX FUNCTION Max function is used to find the maximum value of certain column. This function determines the largest value of all selected values of columns. Syntax: select max (pages) from employee; Max(pages) 94 1 row in set
- 11. MIN FUNCTION The Min function is used to find the minimum value of certain column. This function determines the smallest value of all selected values of a column. syntax: Select min(pages)from employee ; Min(pages) 34 1 row in set