Transforming multiple rows into columns w. single row - sql

Question

I need some help figuring out how best to transform an an array into a row-vector. My array looks like this:
+-----+-------+----------+
| ID | Grade | Quantity |
+-----+-------+----------+
| Ape | Water | Y |
| Ape | Juice | Y |
| Ape | Milk | Y |
+-----+-------+----------+
Each ID can have up to 4 rows distinguished only by grade (Water, Juice, Beer, Milk); the list of possible values is static.
My desired output is this:
+-----+----------+-------+-------+------+------+
| ID | Quantity | Water | Juice | Beer | Milk |
+-----+----------+-------+-------+------+------+
| Ape | Y | 1 | 1 | 0 | 1 |
+-----+----------+-------+-------+------+------+
My own efforts have carried me as far as the PIVOT-operator, which transforms Grade-values into columns, but it doesn't group the rows by ID, leaving me with an equal number of rows post-transformation.
SELECT ID, Quantity, Water, Juice, Beer, Milk
FROM
(SELECT ID, Grade, Quantity FROM Feeding WHERE ID = 'Ape') src
PIVOT(
COUNT(Quantity) FOR [Grade] IN (ID, Quantity, Water, Juice, Beer, Milk)
)AS TransformData
Output:
+-----+----------+-------+-------+------+------+
| ID | Quantity | Water | Juice | Beer | Milk |
+-----+----------+-------+-------+------+------+
| Ape | Y | 1 | 0 | 0 | 0 |
| Ape | Y | 0 | 1 | 0 | 0 |
| Ape | Y | 0 | 0 | 0 | 1 |
+-----+----------+-------+-------+------+------+
Any suggestions?

Answer 1

How about;
;WITH Feeding(id,grade,quantity) as (
select 'Ape','Water','Y' union all
select 'Ape','Juice','Y' union all
select 'Ape','Juice','Y' union all
select 'Ape','Juice','Y' union all
select 'Ape','Juice','Y' union all
select 'Ape','Milk', 'N'
)
SELECT * FROM
(SELECT ID, Grade, Quantity agg, Quantity FROM Feeding WHERE ID = 'Ape') src
PIVOT ( COUNT(agg) FOR [Grade] IN (Water, Juice, Beer, Milk) ) AS TransformData
--
ID Quantity Water Juice Beer Milk
Ape N 0 0 0 1
Ape Y 1 4 0 0

Answer 2

you can try following query:-
SELECT ID, Quantity, CASE WHEN Grade = 'WATER' THEN 1 ELSE 0 END AS WATER,
CASE WHEN Grade = 'JUICE' THEN 1 ELSE 0 END AS JUICE,
CASE WHEN Grade = 'BEER' THEN 1 ELSE 0 END AS BEER,
CASE WHEN Grade = 'MILK' THEN 1 ELSE 0 END AS MILK
FROM YOUR_TABLE;

Answer 3

select id, quantity,
case when grade = 'Water' then 1 else 0 end as Water,
when grade = 'Juice' then 1 else 0 end as Juice,
when grade = 'Milk' then 1 else 0 end as Milk,
when grade = 'Beer' then 1 else 0 end as Beer
from feeding
As the value list is static, this is a way to do it.

Answer 4

Try this
SELECT id
,quantity
,CASE
WHEN grade = 'Water'
THEN 1
ELSE 0
END AS Water
,when grade = 'Juice' then 1 ELSE 0 END AS Juice
,when grade = 'Milk' then 1 ELSE 0 END AS Milk
,when grade = 'Beer' then 1 ELSE 0 END AS Beer
FROM feeding

Answer 5

Try this to get single row result
SELECT Id,Quantity,
SUM(CASE WHEN Grade='Water' THEN 1 ELSE 0 END) AS Water,
SUM(CASE WHEN Grade='Juice ' THEN 1 ELSE 0 END) AS Juice ,
SUM(CASE WHEN Grade='Beer' THEN 1 ELSE 0 END) AS Beer,
SUM(CASE WHEN Grade='Milk' THEN 1 ELSE 0 END) AS Milk
FROM Feed F
GROUP BY Id,Quantity
SQL Fiddle Demo