/courses/sql/combining-tables-with-joins/Recent content in Combining Tables with Joins on DATATWEETSHugoenCopyright (c) 2025 DatatweetsTue, 23 Jun 2026 09:00:00 +0200/courses/sql/combining-tables-with-joins/lesson-1-introduction-to-joins/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/combining-tables-with-joins/lesson-1-introduction-to-joins/Learn how SQL joins stitch two tables into one. Write inner joins, select columns from different tables, and alias tables to keep queries readable./courses/sql/combining-tables-with-joins/lesson-2-joins-with-filtering-grouping-and-sorting/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/combining-tables-with-joins/lesson-2-joins-with-filtering-grouping-and-sorting/Treat a join as a temporary table, then layer WHERE, GROUP BY, and ORDER BY on top of it. Join three or more tables and learn SQL’s clause execution order./courses/sql/combining-tables-with-joins/lesson-3-self-joins-outer-joins-and-cross-joins/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/combining-tables-with-joins/lesson-3-self-joins-outer-joins-and-cross-joins/Join a table to itself, use LEFT, RIGHT, and FULL joins to keep unmatched rows, generate every combination with CROSS JOIN, and join on non-equality conditions./courses/sql/combining-tables-with-joins/lesson-4-combining-results-with-set-operators/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/combining-tables-with-joins/lesson-4-combining-results-with-set-operators/Combine the results of separate SELECT statements vertically with UNION and UNION ALL, find common rows with INTERSECT, and subtract rows with EXCEPT.