In SQL, COALESCE and IS NULL and IS NOT NULL

[@SarunYangkour]

Nice & Informative.

[@menglyhoung]

Appreciate you ❤

[@ToKy-o8j]

Thanks it will help me alot

[@Chiraren]

I learned PostgresSQL before finding this tutorial

[@Chhunlong-v1g]

I believe PostgresSQL is easy...