Question

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

How can I do that?

Answer 1

If you are using Sql server 2005+, then you can use row_number() and partition by TKG and order by cap desc:

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

See SQL Fiddle with Demo

Result:

| 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 |