mysql获取group by的总记录行数:SQL_CALC_FOUND_ROWS
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mysql获取group by内部可以获取到某字段的记录分组统计总数，而无法统计出分组的记录数。 因此可以配合mysql自带的`SQL_CALC_FOUND_ROWS`和`FOUND_ROWS()`函数可以实现。 ```sql SELECT SQL_CALC_FOUND_ROWS t3.id, a,bunch,of,other,stuff FROM t1, t2, t3 WHERE(associate t1,t2,and t3 with each other) GROUPBY t3.id LIMIT 10,20 SELECT FOUND_ROWS() as count; ``` 使用以上两个语句即可完成满足group by的总记录行数。另附：group by 的简单使用方法： ```sql SELECT column_id,count(*) as count FROM my_table group by column_id; ``` 官方文档： [http://dev.mysql.com/doc/refman/5.6/en/group-by-functions.html](http://dev.mysql.com/doc/refman/5.6/en/group-by-functions.html)