SQL COUNT() Function

The COUNT() function returns the number of rows that matches a specified criterion.

Example​

Find the total number of rows in the Products table:

SELECT COUNT(\*)  
FROM Products;

Video Explanation​

Watch

Syntax​

SELECT COUNT(_column_name_) FROM _table_name_ WHERE _condition_;

Demo Database​

Below is a selection from the Products table used in the examples:

Specify Column​

You can specify a column name instead of the asterix symbol (*).

If you specify a column name instead of (*), NULL values will not be counted.

Example​

Find the number of products where the ProductName is not null:

SELECT COUNT(ProductName)  
FROM Products;

Add a WHERE Clause​

You can add a WHERE clause to specify conditions:

Example​

Find the number of products where Price is higher than 20:

SELECT COUNT(ProductID)
FROM Products
WHERE Price > 20;

Ignore Duplicates​

You can ignore duplicates by using the DISTINCT keyword in the COUNT() function.

If DISTINCT is specified, rows with the same value for the specified column will be counted as one.

Example​

How many different prices are there in the Products table:

SELECT COUNT(DISTINCT Price)  
FROM Products;

Use an Alias​

Give the counted column a name by using the AS keyword.

Example​

Name the column "Number of records":

SELECT COUNT(\*) AS \[Number of records\]  
FROM Products;

Use COUNT() with GROUP B​

Here we use the COUNT() function and the GROUP BY clause, to return the number of records for each category in the Products table:

Example​

SELECT COUNT(\*) AS \[Number of records\], CategoryID  
FROM Products  
GROUP BY CategoryID;