SQL Count - What the count() function acually counts?

leandrojlfernandes@gmail.com (Leandro Fernandes) — Sun, 10 Jul 2022 11:44:01 -0600

SQL Count — What the count() function actually counts?

The count() function is widely used in SQL and sometimes without fully understanding the impact that the entry parameter to the function can alter the output of your results. Most commonly, the functions can have the following as inputs parameters:

Count(*)
Count(1)
Count(column name)

Test Scenario

Let’s create a table and insert a few records to try each count variation and compare the results.

Count on Data Trenches

SQL Count - What the count() function acually counts?

SQL Count — What the count() function actually counts?

Test Scenario