title: SQL QUERY: If NULL then take another column but if NULL again ignore it
body: <p>[SQL QUERY]
  Hi, I need to have a date value from a column, if this column has the value NULL het should refer to another column, this should be translated like this:</p>
  <pre><code>SELECT * ISNULL(column1, column2)
  FROM [Table1]
  </code></pre>
  <p>But now if the second column (column2) has also a NULL value he needs to ignore it, how can I please handle this?</p>
  <p>Many thanks in advance!!</p>