TL;DR
Understand how NULL works in SQL. Learn COALESCE, NULLIF, and IS NULL to write queries that handle missing data correctly.
Key concepts
- SQL NULL
- SQL COALESCE
- SQL NULLIF
- SQL IS NULL
TL;DR
Understand how NULL works in SQL. Learn COALESCE, NULLIF, and IS NULL to write queries that handle missing data correctly.
Key concepts