Concat Column Values with a separator in SQL Server - sql-server

Question

I want to concatenate column values with a separator and assign it to variable.
If column value is null, there's no need to add separator.
For example: A|B|C|D
If B is null A|C|D.
I tried with CONCAT function, but if B is null, it results in A||C|D
DECLARE #OldValue VARCHAR(8000);
SELECT #OldValue = CONCAT([FloorCode],'|',
[FloorName],'|',
[BuildingID],'|',
[HCMLocationCode],'|',
[IsActive])
FROM tblFloor_Master
WHERE FloorID = #FloorID;
#FloorID is an input parameter of SP

Answer 1

SELECT #OldValue = CONCAT('',
CASE WHEN [FloorCode] IS NULL THEN '' ELSE CONCAT([FloorCode],'|') END,
CASE WHEN [FloorName] IS NULL THEN '' ELSE CONCAT([FloorName],'|') END,
CASE WHEN [BuildingID] IS NULL THEN '' ELSE CONCAT([BuildingID],'|') END,
CASE WHEN [HCMLocationCode] IS NULL THEN '' ELSE CONCAT([HCMLocationCode],'|') END,
[IsActive])
FROM tblFloor_Master
WHERE FloorID = #FloorID;

Answer 2

You can try the following query.
create table tempTable (id int identity(1, 1),col1 char(1), col2 char(1), col3 char(1), col4 char(1))
insert into tempTable values ('A', NULL, 'C', 'D')
select * into #NewTable from(
select id, col1 as Value from tempTable where col1 is not null
union
select id, col2 as Value from tempTable where col2 is not null
union
select id, col3 as Value from tempTable where col3 is not null
union
select id, col4 as Value from tempTable where col4 is not null
)a
SELECT ID
,STUFF((SELECT '| ' + CAST(Value AS VARCHAR(10)) [text()]
FROM #NewTable
WHERE ID = t.ID
FOR XML PATH(''), TYPE)
.value('.','NVARCHAR(MAX)'),1,1,' ') List_Output
FROM #NewTable t
GROUP BY ID
The output is as shown below
ID List_Output
---------------
1 A| C| D
If you do not want to put space between values then you can try this
SELECT ID
,STUFF((SELECT '|' + CAST(Value AS VARCHAR(10)) [text()]
FROM #NewTable
WHERE ID = t.ID
FOR XML PATH(''), TYPE)
.value('.','NVARCHAR(MAX)'),1,1,'') List_Output
FROM #NewTable t
GROUP BY ID
In this case the output will be
ID List_Output
---------------
1 A|C|D
You can also try the below actual query using stored procedure
create table tblFloor_Master (FloorID int identity(1, 1),
FloorCode char(1),
FloorName char(1),
BuildingID char(1),
HCMLocationCode char(1))
insert into tblFloor_Master values ('A', NULL, 'C', 'D')
GO
--To create a procedure
create proc uspGetConcateValue
#FloorId int
as
BEGIN
select * into #tblFloor_Master from(
select FloorId, FloorCode as Value from tblFloor_Master where FloorCode is not null
union
select FloorId, FloorName as Value from tblFloor_Master where FloorName is not null
union
select FloorId, BuildingID as Value from tblFloor_Master where BuildingID is not null
union
select FloorId, HCMLocationCode as Value from tblFloor_Master where HCMLocationCode is not null
)a
SELECT FloorId
,STUFF((SELECT '|' + CAST(Value AS VARCHAR(10)) [text()]
FROM #tblFloor_Master
WHERE FloorId = t.FloorId
FOR XML PATH(''), TYPE)
.value('.','NVARCHAR(MAX)'),1,1,'') List_Output
FROM #tblFloor_Master t
where FloorID = #FloorId
GROUP BY FloorId
END
Live demo here - Live Demo

Answer 3

Should be simple as doing replace, replace || to | then replace ||| to | since the maximum number of | is 3.
DECLARE #OldValue VARCHAR(8000);
SELECT #OldValue = replace(replace(CONCAT([FloorCode],'|',
[FloorName],'|',
[BuildingID],'|',
[HCMLocationCode],'|',
[IsActive]),'||','|'),'|||','|')
FROM tblFloor_Master
WHERE FloorID = #FloorID;

Answer 4

SELECT
TRIM ('|' FROM
regexp_replace(
CONCAT('','|','COLB','|','','|','COLD','|','COLE')
,'[\|]+'
,'|'
,'g'
)
)