Rank calculation

Question

in table t1 have data like
col1 col2 col3
a     a1     10
a     a2     15
a     a3     30
b     b2     37
b     b1     30
c     c1     42
d     d1     32
i want to put these data along with the rank based on col1 and col3 value .
i want to put the data into another table t2 like this way
col1 col2 col3 col4
a     a1          10          4
a     a2          15          2
a     a3          30          1
a     a4          15          3
b     b2          37          1
b     b1          30          2
c     c1          42          1
d     d1          32          1
how to do this.
Thanks

Answer 1

Hi Solomon,
may be use dense_rank() over(partition by col1 order by col3 desc , col2) nstead
dense_rank() over(partition by col1 order by col3,col2)
SQL> with t as (
  2             select 'a' col1,'a1' col2,10 col3 from dual union all
  3             select 'a','a2',15 from dual union all
  4             select 'a','a3',30 from dual union all
  5             select 'a','a4',15 from dual union all
  6             select 'b','b2',37 from dual union all
  7             select 'b','b1',30 from dual union all
  8             select 'c','c1',42 from dual union all
  9             select 'd','d1',32 from dual
10            )
11  select  col1,
12          col2,
13          col3,
14          dense_rank() over(partition by col1 order by col3 desc , col2) rnk
15    from  t
16    order by col1,
17             rnk;
C CO       COL3        RNK
a a3         30          1
a a2         15          2
a a4         15          3
a a1         10          4
b b2         37          1
b b1         30          2
c c1         42          1
d d1         32          1
8 ligne(s) sélectionnée(s).
SQL>