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2、分组排行, 例如要查询哪个appid的记录条数最多. digoal=# alter table test_1 alter column appidSETSTATISTICS100;ALTERTABLEdigoal=# analyze verbose test_1;INFO: analyzing"public.test_1"INFO:"test_1": scanned20619of20619pages, containing2000000live rows and0dead rows;30000rowsinsample,2000000estima...
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