Use when writing window functions like ROW_NUMBER, RANK, LAG, LEAD, computing running totals, top-N per group, percentile bucketing, gap-and-island queries, tree walks with recursive CTEs, hierarchy traversal, or migrating PostgreSQL or MySQL window-queries to MariaDB. Prevents the common mistake of
Use when writing window functions like ROW_NUMBER, RANK, LAG, LEAD, computing running totals, top-N per group, percentile bucketing, gap-and-island queries, tree walks with recursive CTEs, hierarchy traversal, or migrating PostgreSQL or MySQL window-queries to MariaDB. Prevents the common mistake of using the GROUPS frame which is NOT supported in MariaDB, forgetting to terminate a recursive CTE,