COUNT « Aggregate Functions « Oracle PL / SQL

Oracle PL / SQL

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Oracle PL / SQL » Aggregate Functions » COUNT

1.	COUNT(column) and COUNT(*): count the number of rows passed into the function.
2.	Syntax: COUNT([DISTINCT]\|[ALL] )
3.	Using GROUP BY would tell us how many cars from each vendor we have on the lot:
4.	Find out which maker has a null value car with count()
5.	-Using the COUNT function in Having clause
6.	Example using the COUNT function with group by clause
7.	Count with group by: count for a group value
8.	Get the number of rows in each city group using the COUNT() function
9.	count null
10.	Column alias name for count function
11.	Count(*) - count(column_Name)
12.	count distinct column value
13.	count(1)
14.	count(distinct state)
15.	Count(*) and column renaming
16.	Count() with where clause
17.	Count date field value, and calculation
18.	Count department and calculate average salary
19.	Count employee in a department after grouping by department id
20.	Count employee, group by department id and job title
21.	count(*) - count(onhand)
22.	count(*) vs count(column name)

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