String.Join in SQL

Question

i want to select from a Table called RMA(simplified):

 idRMA| RMA_Number
 -----------------------
 1      RMA0006701
 2      RMA0006730
 3               


        

Answer 1

Use the classic XML PATH-trick for this:

declare @RMA  as table(idRMA int, RMA_Number nvarchar(20))

declare @trelRMA_SymptomCode as table (fiSymptomCode int, fiRMA int)

declare @tdefSymptomCode as table (idSymptomCode int, SymptomCodeNumber nvarchar(4), SymptomCodeName nvarchar(20))

insert into @RMA values
(1,      'RMA0006701'),
(2,      'RMA0006730'),
(3,      'RMA0006736'),
(4,      'RMA0006739'),
(5,      'RMA0006742')

insert into @trelRMA_SymptomCode values
(1,              1),
(1,              2),
(2,              2),
(5,              3),
(7,              3),
(8,              3),
(2,              5),
(3,              5),
(4,              5),
(5,              5)

insert into @tdefSymptomCode values
(1,                '0000',                   'Audio problem'),
(2,                '0100',                   'SIM problem'),
(3,                '0200',                   'Appearance problem'),
(4,                '0300',                   'Network problem'),
(5,                '0500',                   'On/Off problem')

select RMA_Number,
 STUFF(
    (
    SELECT
      ':' + SymptomCodeNumber
    FROM @tdefSymptomCode def 
    join @trelRMA_SymptomCode rel on def.idSymptomCode = rel.fiSymptomCode
    where rel.fiRMA=rma.idRMA
    FOR XML PATH('')
    ), 1, 1, '')
from @rma rma

results in

RMA0006701  0000
RMA0006730  0000:0100
RMA0006736  0500
RMA0006739  NULL
RMA0006742  0100:0200:0300:0500