SQLite equivalent query of the given MSSQL query. - sql

Question

I've been trying to find a way to use the row_number over partition by, but couldn't find how to do so in SQLite.
I'm trying to convert the following the working query from MSSQL syntax to SQLite:
select TKG, hour, CAP, switch, Calls
from
(
select *,
row_number() over(partition by TKG order by cap desc) rn
from yourtable
) t1
where rn = 1
Here's an example with SQLFiddle: http://sqlfiddle.com/#!3/7bf9a/3
Basically, I have the following table:
TKG hour CAP SWITCH CALLS
AAA 7 45 HH 56
AAA 8 35 HH 76
AAA 9 25 HH 43
BBB 7 32 LL 5
BBB 8 43 LL 65
BBB 9 434 LL 65
CCC 7 54 JJ 43
CCC 8 564 JJ 43
CCC 9 54 JJ 65
ddd 7 10 MM 4
ddd 8 10 MM 3
ddd 9 10 MM 5
I need to order by the TKG with the max CAP so the output will look like this:
TKG hour CAP SWITCH CALLS
AAA 7 45 HH 56
BBB 9 434 LL 65
CCC 8 564 JJ 43
ddd 7 10 MM 4

Answer 1

Without knowing unique key it's really hard to do in readable way (no cross apply, no windowed functions). If you can afford to add id into your table, you can do:
select *
from yourtable
where
id in (
select min(y.id)
from yourtable as y
inner join (
select [TKG], max([CAP]) as [CAP]
from yourtable
group by [TKG]
) as y2 on y2.[TKG] = y.[TKG] and y2.[CAP] = y.[CAP]
group by y.[TKG]
)
sql fiddle demo
Considering myself lucky that I don't work in SQLite often :)