title: Cannot drop column MSSQL (after Hibernate?)
body: <p>I created column for tests. Now I want to delete it. Hibernate <code>hbm2ddl.auto = validate</code>. </p>
  
  <p>But after some tests I cant drop column.  </p>
  
  <h3>Cmd:</h3>
  
  <pre><code>alter table [x].[dbo].[tb_monitor] drop column period;
  </code></pre>
  
  <h3>Answer:</h3>
  
  <pre><code>Msg 5074, Level 16, State 1, Line 1
  The object 'DF__tb_monito__perio__6754599E' is dependent on column 'period'.
  Msg 4922, Level 16, State 9, Line 1
  ALTER TABLE DROP COLUMN period failed because one or more objects access this column.
  </code></pre>
  
  <p>This column isn't FK. Did Hibernate created some dependency inside table?</p>