百度移动下拉词排名
rownumber over partition by 优化
row lock contention 优化
优化order by
order by count(*)优化
distribute by rand优化
优化group by
filesort 优化
using filesort优化
优化merge into
union all order by优化
搜狗移动下拉词排名
神马移动下拉词排名