SQL for Data Analytics, Module 4: Joins | INNER, LEFT, RIGHT, FULL, Self Join and UNION

Module 4 of the free SQL for Data Analytics course. Combine data across tables with INNER and LEFT joins, see RIGHT and FULL joins, join a table to itself, and stack results with UNION. Plus the two join traps that catch beginners: ambiguous columns and COUNT(*) after a LEFT JOIN. The Module 3 challenge solution Learn: how a join matches rows, FROM / JOIN / ON, aliases, INNER vs LEFT, the four join types, self joins and UNION Practice: 4 exercises (pause and try them!) Challenge: build a VIP customer report. Post your query in the comments; the solution is at the start of Module 5. #SQL #SSMS #SQLServer #TSQL #DataAnalytics #LearnSQL #SQLForBeginners