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RED SAGSkills

SQL Self Join problems

2 problems, easiest first.

Dates 16Window Functions 13Null Handling 11Aggregation 11Group By 8Joins 7Case When 6Sorting 6Strings 5Subqueries 5Select Filter 4Running Totals 4Ctes 3Recursive Cte 3Set Operations 2Ranking 2Deduplication 2Self Join 2Gaps And Islands 2