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COUNT

The COUNT() function returns the number of records returned by a SELECT query.

caution

NULL values are not counted.

Syntax

COUNT(expression)

Arguments

ArgumentsDescription
expressionAny expression.
This may be a column name, the result of another function, or a math operation.
* is also allowed, to indicate pure row counting.

Return Type

An integer.

Example

Create a Table and Insert Sample Data

CREATE TABLE students (
id INT,
name VARCHAR,
age INT,
grade FLOAT NULL
);

INSERT INTO students (id, name, age, grade)
VALUES (1, 'John', 21, 85),
(2, 'Emma', 22, NULL),
(3, 'Alice', 23, 90),
(4, 'Michael', 21, 88),
(5, 'Sophie', 22, 92);

Query Demo: Count Students with Valid Grades

SELECT COUNT(grade) AS count_valid_grades
FROM students;

Result

| count_valid_grades |
|--------------------|
| 4 |