title: Select datatype of the field in postgres
body: <p>How do I get datatype of specific field from table in postgres ?
  For example 
  I have the following table,
    student_details (
         stu_id   integer,
         stu_name varchar(30 ),
         joined_date timestamp 
     );</p>
  
  <p>In this using the field name / or any other way, I need to get the datatype of the specific field. Is there any possibility ?</p>