title: sum all the value of a column in a table in DB
body: <p>I have column with the name <code>number</code> and table name <code>data</code>.</p>
  
  <p>The column number has numbers in range 1-9.(just some data)</p>
  
  <p>I need to sum all these values in the column. How do i do that?</p>
  
  <p>Any easy simple command. I tried <code>sum(number)</code> but not coming</p>