1DROP TABLE IF EXISTS t1, t2;
2CREATE TABLE t1 (id INTEGER, grp TINYINT, id_rev INTEGER);
3SELECT COUNT(*) FROM t1;
4COUNT(*)
54201000
6SELECT COUNT(DISTINCT id) FROM t1 GROUP BY grp;
7# Begin cleanup
8SET session myisam_sort_buffer_size = @orig_myisam_sort_buffer_size;
9DROP TABLE t1;
10