Question

I want to make a SELECT and bring the info from a column and his values. I know that I need to access *information_schema* then I need to make another SELECT inside with the *column_name* in the specific row to acess that value.

SELECT column_name,
   DATA_TYPE,
   CHARACTER_MAXIMUM_LENGTH,
   (? ... SELECT COLUMN_NAME FROM MYTABLE ... ?)
FROM information_schema.columns
WHERE table_name = 'MYTABLE'
ORDER BY ordinal_position

How to change the COLUMN_NAME with the column in the row to get the result?

Answer 1

I don’t know how you want this if there are more than one row in your table. This will work for a table with one row. If there are more than one row in the table it will take one of the rows in the table.

SELECT I.COLUMN_NAME,
       I.DATA_TYPE,
       I.CHARACTER_MAXIMUM_LENGTH,
       (
       SELECT T.X.value('/*[local-name(.)=sql:column("I.COLUMN_NAME")][1]', 'nvarchar(max)')
       FROM 
         (
         SELECT *
         FROM MyTable
         FOR XML PATH(''), TYPE
         ) AS T(X)
       ) AS COLUMN_VALUE
FROM INFORMATION_SCHEMA.COLUMNS AS I
WHERE I.TABLE_NAME = 'MyTable'
ORDER BY I.ORDINAL_POSITION

SQL Fiddle