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9 lines
225 B
Plaintext
9 lines
225 B
Plaintext
DROP TABLE IF EXISTS t1, t2;
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CREATE TABLE t1 (id INTEGER, grp TINYINT, id_rev INTEGER);
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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4181000
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SELECT COUNT(DISTINCT id) FROM t1 GROUP BY grp;
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DROP TABLE t1;
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set @@read_buffer_size=default;
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