mysql获取group by的总记录行数方法

mysql获取group by的总记录行数方法

原方法：

1. group by 后分组的前十条，在页面展示：

SELECT column_id,count(*) as count FROM my_table group by column_id limit 10;

2. group by的总记录数，也需要在页面显示：

select count(*) from (SELECT column_id,count(*) as count FROM my_table group by column_id) T;

新方法：

mysql使用关键字SQL_CALC_FOUND_ROWS获取group by的总记录行数

SELECT SQL_CALC_FOUND_ROWS column_id,count(*) as count FROM my_table group by column_id limit 10;
select FOUND_ROWS();