IT-Planet 2026: tasks of the second stage on PostgreSQL
Summary
This article presents the second-stage tasks for the IT-Planeta 2026 PostgreSQL competition. The content centers on solving several advanced SQL problems using PostgreSQL features such as CTEs, recursive queries, window functions, lateral joins, JSONB, and string processing. Each task includes schema definitions, sample data, and expected outputs that guide participants toward a working SQL solution. The material is instructional and technical, aimed at database developers and competitive programmers.
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