https://learningsql.org/ monthly 1 https://learningsql.org/lessons weekly 0.9 https://learningsql.org/lessons/01-introduction weekly 0.9 https://learningsql.org/lessons/02-selecting-data weekly 0.9 https://learningsql.org/lessons/03-filtering-and-sorting weekly 0.9 https://learningsql.org/lessons/04-inserting-and-updating weekly 0.9 https://learningsql.org/lessons/05-joins-and-relationships weekly 0.9 https://learningsql.org/lessons/06-aggregation-and-grouping weekly 0.9 https://learningsql.org/lessons/07-subqueries weekly 0.9 https://learningsql.org/lessons/08-indexes-and-performance weekly 0.9 https://learningsql.org/lessons/09-views-and-ctes weekly 0.9 https://learningsql.org/lessons/10-transactions weekly 0.9 https://learningsql.org/lessons/11-triggers-and-automation weekly 0.9 https://learningsql.org/lessons/12-window-functions weekly 0.9 https://learningsql.org/lessons/13-database-design weekly 0.9 https://learningsql.org/lessons/14-migrations weekly 0.9 https://learningsql.org/lessons/15-capstone-project weekly 0.9 https://learningsql.org/lessons/16-string-functions weekly 0.9 https://learningsql.org/lessons/17-date-and-time-functions weekly 0.9 https://learningsql.org/lessons/18-null-handling weekly 0.9 https://learningsql.org/lessons/19-set-operations weekly 0.9 https://learningsql.org/lessons/20-data-types-and-casting weekly 0.9 https://learningsql.org/lessons/21-constraints-and-keys weekly 0.9 https://learningsql.org/lessons/22-recursive-queries weekly 0.9 https://learningsql.org/lessons/23-json-in-sql weekly 0.9 https://learningsql.org/lessons/24-triggers-and-events weekly 0.9 https://learningsql.org/lessons/25-query-optimization weekly 0.9 https://learningsql.org/playground monthly 0.8 https://learningsql.org/privacy monthly 0.2 https://learningsql.org/terms monthly 0.2