Super Interesting SQL Problem | Practice SQL Queries
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A walkthrough of solving a triangular grouping SQL problem using PostgreSQL. The approach converts a comma-separated string into rows with string_to_array and unnest, assigns row numbers using WITH ORDINALITY, then uses a recursive CTE to simulate loop-like iteration — fetching 1 value in iteration 1, 2 in iteration 2, and so on. The final output is assembled using string_agg with GROUP BY on the iteration number.
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