COUNT function in MySQL

MySQL COUNT In MySQL, the COUNT function is used to get the count of an expression.

Syntax:

SELECT COUNT (aggregate_expression)  
FROM table_name  
WHERE conditions;

Parameters:

Aggregate_expression: It is used to specify the column or expression to be utilized by the COUNT function.

Example: Items table:

ID	NAME	QUANTITY
1	Electronics	30
2	Sports	45
3	Fashion	50
4	Grocery	30
5	Toys	50

 

Query:

SELECT quantity, COUNT(*) AS “Number of Items”
FROM items
GROUP BY quantity;

Output:

QUANTITY	Number of Items
30	2
45	1
50	2

Explanation: The ‘items’ is an already existing table from which we are counting the number of Items of the same quantity value.