By default, the COUNT function uses the ALL keyword whether you specify it or not. For example, if you have a group (1, 2, 3, 3, 4, 4) and apply the COUNT function, the result is 6. The ALL keyword will include the duplicate values in the result.The result of the COUNT function depends on the argument that you pass to it. The following illustrates the syntax of the SQL COUNT function: COUNT( expression) Code language: SQL (Structured Query Language) ( sql )
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 SQL COUNT function is an aggregate function that returns the number of rows returned by a query. Summary: in this tutorial, you will learn how to use the SQL COUNT function to get the number of items in a group.
