sql server - SQL Customer leave before trail ends -


I need help creating a SQL query for a sports rental site, I have to know the customers who Leave your test before the end of the test

Then the query will contain only the user table and I will have to do such a question: - 

  Select user from user where Date dated for less than 30 days   
 The database is MS SQL 2008.  
 What do I still have: -  
  Select from user where (date and gt; = datejoded - 30)   
 But this does not work.  
   
 
 
 You should use the DATEDIFF function:

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