大约有 47,000 项符合查询结果（耗时：0.0388秒） [XML]
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...ct i from g group by i) a;
count
10001
(1 row)
Time: 594,481 ms
http://www.pgsql.cz/index.php/PostgreSQL_SQL_Tricks_I
so be careful ... :)
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