get last enterd value

Question

hello!
      i have a table named schoolentry. it contain the following cols
name,subject, course.
there is a dropdown. there are 26 names in the dropdown. data is being entered in the database table from some other web page. now i want that when i select an element from dropdown and click on button it shows me the last entered close value of that name from the database. can some body tell me how is it possible?