Understanding the distinctions between these essential SQL commands is crucial. Be ready to discuss their purposes and syntax, as well as when to use each statement in data manipulation.
Join operations are fundamental in combining data from multiple tables. Familiarize yourself with the various types of joins and their implications for result sets.
Both GROUP BY and ORDER BY are used to organize data, but they serve distinct purposes. Understand how these clauses function and when to apply them in SQL queries.
NULL values can present challenges in data analysis. Be prepared to discuss techniques for handling NULL values, including IS NULL, IS NOT NULL, and COALESCE.