How to create a separate column for each color if at least one value exists in a group by clause? Does each color column need a separate select statement with group by clause. Thanks in advance.
For example
x
SELECT
COUNT(ColorID) AS IcdCodecount,
Colorname
-- Blue -> if at least one value exists in 1, 10, 12
-- Red -> if at least one value in 0, 3, 4, 15
-- White -> if at least one value in 11, 12, 13, 14
-- Yellow -> if at least one value in 20, 21, 22, 23
FROM
TestTable
WHERE ColorID IN (
1, 10, 12, -- blue
0, 3, 4, 15, -- Red
11, 12, 13, 14, -- White
20, 21, 22, 23, -- yellow)
GROUP BY Colorname
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Answer
You can use conditional aggregation:
(case when sum(case when colorId in (1, 10, 12) then 1 else 0 end) > 0 then 1 else 0 end) as is_blue,
(case when sum(case when colorId in (0, 3, 4, 15) then 1 else 0 end) > 0 then 1 else 0 end) as is_red,
(case when sum(case when colorId in (11, 12, 13, 14) then 1 else 0 end) > 0 then 1 else 0 end) as is_white,
(case when sum(case when colorId in (20, 21, 22, 23) then 1 else 0 end) > 0 then 1 else 0 end) as is_yellow