SQL Basics
SELECT, WHERE, ORDER BY, GROUP BY and HAVING. Written by you and executed for real.
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Filtering before and after grouping
Foundation
- Not triedFiltering before and after groupingFoundation
- Not triedRemoving duplicates from a resultFoundation
- Not triedThe order the parts of a query run inFoundation
- Not triedWhat does WHERE do?Foundation
- Not triedTwo counts that disagreeCore
- Not triedWhat does COUNT ignore?Core
- Not triedWHERE or HAVING?Core
- Not triedAn average that is not the averageChallenge
- Not triedPage 500 is slow, and page 2 skipped a rowChallenge