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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(<expr>)

Arguments​

ArgumentsDescription
<expr>Any 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         |