Web Reference: The SQL COUNT function is an aggregate function that returns the number of rows returned by a query. For example, you can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc. The most commonly used SQL aggregate functions are: Aggregate functions ignore null values (except for COUNT(*)). We will go through the aggregate functions above in the next chapters. This is called aggregation, and SQL provides five core functions for it: COUNT, SUM, AVG, MIN, and MAX. Aggregate functions are the foundation of every report, dashboard, and analytics query you will ever write.
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