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count_distinct3.result
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DROP TABLE IF EXISTS t1, t2; CREATE TABLE t1 (id INTEGER, grp TINYINT, id_rev INTEGER); SELECT COUNT(*) FROM t1; COUNT(*) 4201000 SELECT COUNT(DISTINCT id) FROM t1 GROUP BY grp; # Begin cleanup SET session myisam_sort_buffer_size = @orig_myisam_sort_buffer_size; DROP TABLE t1;