pull data from one column into another table

Question

I have two tables as:

Table_1

Question01  Answer01   Question02  Answer02     QuestionN   AnswerN
-------------------------------------------------------------------
Favourite     Red      Favourite     Chips      Favourite     Black Beatles
Colour?                Food?                    Song?

Table_2

No.       
----------
Question01  
Question02  
...
QuestionN   

And I want to get a result that looks like this:

No.       | Questions 
----------
Question01  Favourite Colour?
Question02  Favourite Food?
...
QuestionN   Favourite Song?

I need the resulting table to be dynamic as the number of questions can vary.
Does anyone know how I would go about doing this?

Answer 1

You can use dynamic sql and unpivot for this:

DECLARE @sql NVARCHAR(max)
DECLARE @column_list NVARCHAR(max) = N''

SELECT @column_list += QUOTENAME(q) + ',' FROM Table_2 
SET @column_list = SUBSTRING(@column_list, 1, LEN(@column_list) -1)

SET @sql = CONCAT(N'
SELECT up.[No.], up.[Questions] FROM (
    SELECT
        ',@column_list,N' 
    FROM Table_1
) p
UNPIVOT ([No.] FOR [Questions] IN (',@column_list,N')) AS up')

PRINT @sql

EXEC (@sql)