How to find the closest higher value?

Hi all

I want to select the closest higher value in my data (test data are below):
with test_data as
( select 0.21 as val1, 0.19 as val2 from dual
  union all
  select 0.21 as val1, 0.29 as val2 from dual
  union all
  select 0.21 as val1, 0.49 as val2 from dual
  union all
  select 0.67 as val1, 0.49 as val2 from dual
  union all
  select 0.67 as val1, 0.69 as val2 from dual
)
select * from 
(
select 
val1,
val2,
rank() over (order by abs(val2 - val1)) nearest
from test_data
)
where nearest = 1;
output:
VAL1    VAL2    NEAREST
0.21     0.19     1
0.67     0.69     1
Output of this query is the NEAREST value to the value in the column of VAL1. But I would get the SUPERIOR value CLOSEST. As below the value at the higher value 0.21 closest isn't 0.29 0.19.

desired output:
VAL1    VAL2
0.21     0.29
0.67     0.69
Is it possible to get the features you want using analytical functions?

Thx for the help!

Kind regards

Jiri

Published by: Jiri n. 10 October 2012 01:14 
with test_data as
( select 0.21 as val1, 0.19 as val2 from dual
  union all
  select 0.21 as val1, 0.29 as val2 from dual
  union all
  select 0.21 as val1, 0.49 as val2 from dual
  union all
  select 0.67 as val1, 0.49 as val2 from dual
  union all
  select 0.67 as val1, 0.69 as val2 from dual
)

select
 val1
,val2
,first_value(val2) over (partition by val1 order by
   case when val2 >= val1 then 1 else 2 end
   , val2
 ) nearest
from test_data

VAL1 VAL2 NEAREST
.21 .29 .29
.21 .49 .29
.21 .19 .29
.67 .69 .69
.67 .49 .69

Tags: Database

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