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Linux host.jcukjv-lwsites.com 4.18.0-553.22.1.el8_10.x86_64 #1 SMP Tue Sep 24 05:16:59 EDT 2024 x86_64
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mysql-test
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View File Name :
bench_count_distinct.result
drop table if exists t1; create table t1(n int not null, key(n)) delay_key_write = 1; select count(distinct n) from t1; count(distinct n) 100 explain extended select count(distinct n) from t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range n n 4 NULL 21 100.00 Using index for group-by Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select count(distinct `test`.`t1`.`n`) AS `count(distinct n)` from `test`.`t1` drop table t1;