Gurus, I have a table like below
Id Name Source Value
1 a Dx C
2 b Rx G
3 C Tx H
I have 3 other tables like T1,T2 and T3 with structure as below. Based on "Source" column in parent table, I need to fetch "Data column" and show as result. If multiple records match need all record as comma-seperated
T1
Id Data
Dx 123
DX 011
T2
Id Data
Rx 456
Rx 022
T3
Id Data
Tx 789
I need Output as in T-SQL
Id Name Source Value Data
1 a Dx C 123,011
2 b Rx G 456 ,022
3 C Tx H 789
I tried with Case when but not successful. Need inputs
Try this:
DECLARE @t TABLE(ID INT, Name CHAR(1), Source CHAR(2), Value CHAR(1))
DECLARE @t1 TABLE(ID CHAR(2), Data NVARCHAR(20))
DECLARE @t2 TABLE(ID CHAR(2), Data NVARCHAR(20))
DECLARE @t3 TABLE(ID CHAR(2), Data NVARCHAR(20))
INSERT INTO @t VALUES
(1, 'a', 'Dx', 'C'),
(2, 'b', 'Rx', 'G'),
(3, 'c', 'Tx', 'H')
INSERT INTO @t1 VALUES('Dx', '1231')
INSERT INTO @t1 VALUES('Dx', '1232')
INSERT INTO @t1 VALUES('Dx', '1233')
INSERT INTO @t2 VALUES('Rx', '4561')
INSERT INTO @t2 VALUES('Rx', '4562')
INSERT INTO @t3 VALUES('Tx', '789')
SELECT t.ID ,
t.Name ,
t.Source ,
t.Value ,
COALESCE(c1.Data1, c2.Data2, c3.Data3) AS Data
FROM @t t
OUTER APPLY (SELECT STUFF((SELECT ',' + Data
FROM @t1 t1 WHERE t.Source = t1.ID
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'') AS Data1) c1
OUTER APPLY (SELECT STUFF((SELECT ',' + Data
FROM @t2 t2 WHERE t.Source = t2.ID
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'') AS Data2) c2
OUTER APPLY (SELECT STUFF((SELECT ',' + Data
FROM @t3 t3 WHERE t.Source = t3.ID
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'') AS Data3) c3
Output:
ID Name Source Value Data
1 a Dx C 1231,1232,1233
2 b Rx G 4561,4562
3 c Tx H 789
Version with CASE expression:
SELECT t.ID ,
t.Name ,
t.Source ,
t.Value ,
o.Data
FROM @t t
OUTER APPLY ( SELECT CASE t.Source
WHEN 'Dx' THEN STUFF((SELECT
',' + Data
FROM @t1 t1
WHERE t.Source = t1.ID
FOR XML PATH('') ,
TYPE
).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
WHEN 'Rx' THEN STUFF((SELECT
',' + Data
FROM @t2 t2
WHERE t.Source = t2.ID
FOR XML PATH('') ,
TYPE
).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
WHEN 'Tx' THEN STUFF((SELECT
',' + Data
FROM @t3 t3
WHERE t.Source = t3.ID
FOR XML PATH('') ,
TYPE
).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
END AS DATA
) o
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