title: Output data from the date of activation of more than one year
body: <p>I have table clients:</p>
  
  <pre><code>CREATE TABLE clients (
  id  INT AUTO_INCREMENT NOT NULL,
  tariff VARCHAR(255) NOT NULL NULL,
  validity VARCHAR(255) NOT NULL,
  phoneNumber VARCHAR(255) NOT NULL ,
  PRIMARY KEY(id)
  ) ENGINE=InnoDB CHARACTER SET=UTF8;
  
  INSERT INTO clients (id,tariff,validity,phoneNumber) VALUES    (1,"tariff1","10-02-2015","380938474271");
  INSERT INTO clients (id,tariff,validity,phoneNumber) VALUES (2,"tariff1","10-02-2016","380938474272");
  INSERT INTO clients (id,tariff,validity,phoneNumber) VALUES (3,"tariff2","12-01-2017","380938474273");
  INSERT INTO clients (id,tariff,validity,phoneNumber) VALUES (4,"tariff3","10-01-2017","380938474274");
  INSERT INTO clients (id,tariff,validity,phoneNumber) VALUES (5,"tariff3","11-02-2017","380938474275");
  </code></pre>
  
  <p>My field validity is a date of activation. 
  How can I select from this table field with date of activation  of more than one year ? Example, for this table it will clients with id 1 and 2.</p>