SQL CASE in SELECT clause - sql-server-2014

Question

I need to add a concatenated field to my SELECT clause based on the results of my WHERE clause. Here is my current query:
Declare
#Low numeric(13,0) = 10000,
#High numeric(13,0) = 100000000000,
#Name varchar(100) = '%',
#Stname varchar(100) = '%georgia',
#Sumlev varchar(3) = 1,
#County varchar(30) = 123456,
#Place varchar (5) = 8,
#Gid2 varchar(5),
#Gid2_1 varchar (7);
if object_id('tempdb..#GeoID2') is not null drop table #GeoID2
SELECT
SUMLEV, State, County, Place, Name, Stname, ESTIMATESBASE2010, CONCAT(REPLICATE('0', 2 - LEN(STATE)) + STATE, REPLICATE('0', 3 - LEN(COUNTY)) + COUNTY) AS Gid2
INTO
#GeoID2
FROM
[CensusData].[dbo].[SUB-EST2014_ALL]
WHERE
(NOT (SUMLEV = #Sumlev)) AND (NOT (County = #County)) AND (NOT (PLACE = #Place)) AND
(ESTIMATESBASE2010 > #Low) AND (ESTIMATESBASE2010 < #High) AND (Name LIKE #Name) and (Stname LIKE #Stname)
SELECT
[#GeoID2].SUMLEV, [#GeoID2].State, [#GeoID2].County, [#GeoID2].Place, [#GeoID2].Stname, [#GeoID2].Name, [#GeoID2].ESTIMATESBASE2010, [ACS_14_5YR_S1901_with_ann].[HC01_EST_VC13] as Avg_Salary, [#GeoID2].Gid2, [#GeoID2].Gid21
FROM
[CensusData].[dbo].[#GeoID2] INNER JOIN
[CensusData].[dbo].[ACS_14_5YR_S1901_with_ann] ON [CensusData].[dbo].[#GeoID2].Gid2 = [CensusData].[dbo].[ACS_14_5YR_S1901_with_ann].[GEO id2]
ORDER BY
[#GeoID2].NAME
I need to add a CASE statement to my first SELECT clause to assign a value to Gid2. The current value is assigned as:
CONCAT(REPLICATE('0', 2 - LEN(STATE)) + STATE, REPLICATE('0', 3 - LEN(COUNTY)) + COUNTY) AS Gid2
What I need to do is check the value of [County] before I assign this value. Based on that result I will use one of two formulas. Here is what I tried (that does not work):
Case
When (County = 0)
Then 'CONCAT(REPLICATE('0', 2 - LEN(STATE)) + STATE, REPLICATE('0', 5 - LEN(PLACE)) + PLACE) AS Gid2'
Else 'CONCAT(REPLICATE('0', 2 - LEN(STATE)) + STATE, REPLICATE('0', 3 - LEN(COUNTY)) + COUNTY) AS Gid2'
End
I am not sure that using CASE is the right way to go, but I can't figure out any other way to approach this. Can someone help?

Answer 1

Ok I figured it out. I was using ' in front of my Concat function when I should have been using (. Here is a working query:
Declare
#Low numeric(13,0) = 10000,
#High numeric(13,0) = 100000000000,
#Name varchar(100) = '%',
#Stname varchar(100) = '%georgia',
#Sumlev varchar(3) = 1,
#County varchar(30) = 123456,
#Place varchar (5) = 8,
#Gid2 varchar(5),
#Gid2_1 varchar (7);
if object_id('tempdb..#GeoID2') is not null drop table #GeoID2
SELECT
SUMLEV, State, County, Place, Name, Stname, ESTIMATESBASE2010,
Case
When (County = 0)
Then (CONCAT(REPLICATE('0', 2 - LEN(STATE)) + STATE, REPLICATE('0', 5 - LEN(PLACE)) + PLACE))
Else (CONCAT(REPLICATE('0', 2 - LEN(STATE)) + STATE, REPLICATE('0', 3 - LEN(COUNTY)) + COUNTY))
End AS Gid2
INTO
#GeoID2
FROM
[CensusData].[dbo].[SUB-EST2014_ALL]
WHERE
(NOT (SUMLEV = #Sumlev)) AND (NOT (County = #County)) AND (NOT (PLACE = #Place)) AND
(ESTIMATESBASE2010 > #Low) AND (ESTIMATESBASE2010 < #High) AND (Name LIKE #Name) and (Stname LIKE #Stname)
SELECT
[#GeoID2].SUMLEV, [#GeoID2].State, [#GeoID2].County, [#GeoID2].Place, [#GeoID2].Stname, [#GeoID2].Name, [#GeoID2].ESTIMATESBASE2010, [ACS_14_5YR_S1901_with_ann].[HC01_EST_VC13] as Avg_Salary, [#GeoID2].Gid2
FROM
[CensusData].[dbo].[#GeoID2] INNER JOIN
[CensusData].[dbo].[ACS_14_5YR_S1901_with_ann] ON [CensusData].[dbo].[#GeoID2].Gid2 = [CensusData].[dbo].[ACS_14_5YR_S1901_with_ann].[GEO id2]
ORDER BY
[#GeoID2].NAME