SQL Server with non-alphabetic value as column name - sql-server

Question

I am building a pivot query inside a CTE. I have a table Table_1:
Store Count xCount
------- ---- ------
101 1 138
109 1 59
101 2 282
109 2 97
105 3 60
109 3 87
105 4.a 60
109 4.b 87
In Table_1, datatype of column count is varchar(10).
I used dynamic pivot query to pivot Table_1
DECLARE #DynamicCol AS NVARCHAR(MAX),
#SQL AS NVARCHAR(MAX)
select #DynamicCol = STUFF((SELECT distinct ',' + QUOTENAME(count)
from table_1
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #SQL = ';WITH CTE as (
SELECT store,' + #DynamicCol + ' from
(
select * from table_1
) res
pivot
(
MAX(xCount)
for Count in (' + #DynamicCol + ')
) piv ) SELECT *
FROM CTE where 4.a is null'
execute(#SQL);
and get result as :
| STORE | 1 | 2 | 3 | 4.a |
+-------+-----+-----+-----+-----+
| 101 | 138 | 282 | null| null|
| 105 | null| null| 60 | 60 |
| 109 | 59 | 97 | 87 | 87 |
Now, I tried to get data from column 3 and 4.a where 3 and 4.a is null.
The query I build to get data is
Select * from CTE where 3 is null
Select * from CTE where 4.a is null
Also i tried to use this inside case statement as :
Select *,case when (3 is null) then 'some result' else '' end from CTE
In every query I am not getting any value returned by queries.
I tried by to append 'X' in each pivoted column and remove '.' from column anme, like column name looks like
| STORE | X1 | X2 | X3 | X4a |
+-------+-----+-----+-----+-----+
| 101 | 138 | 282 | null| null|
| 105 | null| null| 60 | 60 |
| 109 | 59 | 97 | 87 | 87 |
I am not able to query for this. Could anyone help me or suggest me any other idea to get data using above mentioned query ?

Answer 1

You have to wrap identifier that starts with digit with []:
DECLARE #DynamicCol AS NVARCHAR(MAX),
#SQL AS NVARCHAR(MAX)
select #DynamicCol = STUFF((SELECT distinct ',' + QUOTENAME(count)
from table_1
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #SQL = ';WITH CTE as (
SELECT store,' + #DynamicCol + ' from
(
select * from table_1
) res
pivot
(
MAX(xCount)
for Count in (' + #DynamicCol + ')
) piv ) SELECT *
FROM CTE where [4.a] is null' -- here
execute(#SQL);