Conditional summary rows

Question

HI,
I have a table which contains of data about users entering games.
game_id (int) | user_id (int) | entry_created (datetime)
I need to create a query which displays how many users entered certain times in a particular game. E.g. for game_id=1
Nr_of entries | Nr_of_users
1        15
2        8
3        7
4        etc.
5
6
7
8
9
10
10+
20+
50+
100+
500+
It means that 15 users entered once, 8 users twice, 7 users 3 times, etc.
The list has to be dynamic, that is if there are no users with 50+ entries then the remaining rows should not be generated. I use 2008.
Thanks.
P.

Answer 1

Hi Pelso,
According to your description, you want to count the number of users based on entries. Right?
In this scenario, we can use Case .... When condition to name each kind of entries as sub query, then use count() to get numbers. Use the query below:
select NumberOfEntries as 'Nr_of entries',COUNT(Game_id) as 'Nr_of users'
from
select
case
when entries=1 then '1'
when entries=2 then '2'
when entries=3 then '3'
when entries=4 then '4'
when entries=5 then '5'
when entries=6 then '6'
when entries=7 then '7'
when entries=8 then '8'
when entries=9 then '9'
when entries=10 then '10'
when entries>10 and entries<20 then '10+'
when entries>=20 and entries<50 then '20+'
when entries>=50 and entries<100 then '50+'
when entries>=100 and entries<200 then '100+'
when entries>=200 and entries<500 then '500+'
when entries>=500 then '500+'
else 'other'
end
as NumberOfEntries,Game_id
from
select Game_id,COUNT(entry_created) as entries from #t group by Game_id
group by NumberOfEntries
If you have any question, please feel free to ask.
Best Regards,
Simon Hou