In this sample dataset, I have some Colors : "Red" and "Blue" and some Fruit : "Apple" and "Grapes" associated with a person/name.
My goal is to add a column for each of these groupings, called "Colors" and Fruit . These newly added columns would count +1 whenever the value is > 0 for each of their respective grouping.
For example if either "Red" or "Blue" contain a value > 0, we will add +1 to Colors . For John Smith, since both the Red and Blue columns contain a value > 0, the Colors column will be 2. Here is the expected output:
I know case statements can add 1 or 0, but how do we do this when we have 2 columns per grouping?
You do not need in CASE.
SELECT blue, red, (blue > 0) + (red > 0) colors,
apple, grapes, (apple > 0) + (grapes > 0) fruit
FROM source_table
The values in source table shouldn't be NULL.
SELECT
*,
((CASE WHEN apple > 0 THEN 1 ELSE 0 END) + (CASE WHEN WHEN grapes > 0 THEN 1 ELSE 0 END)) as fruit,
((CASE WHEN red > 0 THEN 1 ELSE 0 END) + (CASE WHEN blue > 0 THEN 1ELSE 0 END)) as colors
from table
assuming the source data is in a pivoted state
with cte as (
select 'john' as name, 2 as blue, 3 as red, 2 as apple, 4 as grape union all
select 'tom', 0 , 8, 0, 0
)
select
name
, blue
, red
, coalesce((blue > 0),0)
+ coalesce((red > 0),0)
as colours
, apple
, grape
, coalesce((apple > 0),0)
+ coalesce((grape > 0),0)
as fruits
from cte
name | blue | red | colours | apple | grape | fruits :--- | ---: | --: | ------: | ----: | ----: | -----: john | 2 | 3 | 2 | 2 | 4 | 2 tom | 0 | 8 | 1 | 0 | 0 | 0
db<>fiddle here
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