NULL, CASE, Sorting, and Dates

NULL, CASE, Sorting, and Dates

Now that we've covered basic retrieval in SQL: Select, Where, From, clean query structure in SQL Query Order and Aliases, and predicate logic in Filtering: LIKE, IN, BETWEEN, AND, OR, NOT, we're ready for the beginner mistakes that show up constantly in interviews.

This lesson focuses on four practical query skills:

• Handling NULL correctly
• Creating readable labels with CASE
• Sorting results with ORDER BY
• Filtering date and timestamp values safely

These are still querying fundamentals. We are not combining tables yet — that comes next in Joins in SQL.