title: "Conversion failed when converting the varchar value 'NULL' to data type int"
body: <p>When I insert records into a long table,I am getting the error
  "Conversion failed when converting the varchar value 'NULL' to data type int"
  How can I determine which column errors out?</p>
  
  <p>The table has many fields and millions of records. Each iteration takes 10 minutes to bomb when I try to insert "NULL" string into integer column somewhere. I thought SQL server can tell me exact name of the column :(</p>