title: Import CSV with variable columns into Sql Database using Azure Data Factory
body: <p>I am trying to import csv files from blob storage into a sql server database using Azure Data Factory.  These csv files do not have a consistent format.  Not all csv files have the same number of columns.  </p>
  
  <p>How can I check to see if a column exists in the csv file and if it doesn't just insert a NULL value for that column into the SQL Server database?</p>