https://sqlbolt.com/ - 브라우저에서 SQL을 직접 실행하면서 빠르게 학습 가능 1: SELECT queries 101 2~3: Queries with constraints 4: Filtering and sorting Query results 5: Simple SELECT Queries 6: Multi-table queries with JOINs 7: OUTER JOINs 8: A short note on NULLs 9: Queries with expressions 10~11: Queries with aggregates 12: Order of execution of a Query 13: Inserting rows 14: Updating rows 15: Deleting rows 16: Creating tables 17: Altering tables 18: Dropping tables Text-to-speech function is limited to 200 characters | 
