intermediateDatabase435 of 469
INNER JOIN vs LEFT JOIN.
Tests whether you know INNER JOIN returns only rows with matches in both tables, while LEFT JOIN returns every row from the left table regardless of a match, filling unmatched right-side columns with NULL -- a distinction that matters whenever you need to preserve rows with no related data.
Ready to master this question?
Generate a complete walkthrough — background, the full answer in plain language, a working code example explained line by line, a real-world scenario, common mistakes, and how this same question gets asked in different ways.
Sign in to generate a response