CODEWITHSUNDEEP
sqloracle-databasegroup-bysubtraction
valter.vx
valter.vx

Reputation: 137

Subtraction of values based on IDs and group after

I'm using Oracle.

Having a table as:

Year   Type   Value
2011   1       500
2011   2       550
2011   3       600
...
...
2012   1       600
2012   2       750
2012   3       930

I need to subtract all the values from different types, grouped by year. The operation would be:

For 2011 -> 1-2-3 (500-550-600)

For 2012 -> 1-2-3 (600-750-930)

For ...

The result should be:

Year   Value
2011   -650  
2012   -1080 
...    ...

I'm just not managing to get this query working..

Upvotes: 0

Views: 8547

Answers (2)

jarlh
jarlh

Reputation: 44796

You mean GROUP BY, CASE to decide sign +for type 1, - for others:

select "year", 
       SUM(case when type = 1 then value else -value end)
from yourtable
group by "year"

Upvotes: 0

Gordon Linoff
Gordon Linoff

Reputation: 1270463

Use conditional aggregation:

select sum(case when type = 1 then value else - value end) as value
from table t
group by year;

Upvotes: 8

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