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6-1-1. external merge

-- [SQL-6-1-1-a] EXPLAIN (ANALYZE,BUFFERS,COSTS OFF) SELECT t1.* FROM startdbpg.tr_ord_big T1 WHERE t1.ord_dtm >= '2023-01-01'::date AND t1.ord_dtm < '2023-02-01'::date ORDER BY t1.shop_id ,t1.mbr_id;
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-- [SQL-6-1-1-b] SHOW work_mem;
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