feat: explain different possible behaviors of count()

gvwilson / sql-tutorial

The Querynomicon: An Introduction to SQL for Wary Data Scientists

https://gvwilson.github.io/sql-tutorial/

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Closed gvwilson closed 5 months ago

gvwilson commented 5 months ago

Explain that count will have a different behavior if you use count(*) or count(colum_name) and you have null data in the table.

— @yabellini