SQL面试题-直播APP统计PV&UV

hive> select * from temp;
OK
20180302  Page1 112 ios
20180302  Page2 113 android
20180303  Page1 117 ios
20180303  Page2 117 ios
20180304  Page3 138 android
Time taken: 0.222 seconds, Fetched: 5 row(s)
hive> select `date`,count(uid) as pv,count(distinct uid) as uv from temp group by `date`;
OK
20180302  2 2
20180303  2 1
20180304  1 1
Time taken: 7.692 seconds, Fetched: 3 row(s)

SQL如下

select `date`,count(uid) as pv,count(distinct uid) as uv from temp group by `date`;