How to display the table select query values in the same form in drupal 7?
This is actually very easily done out of the box with form-api, you just have to know how to use it. You have to read up on drupal 7 forms, especially the validate and submit functions/hooks. A quick and dirty example to output form values in submit function (called after function form_*_validate() hook) is shown below.

function form_example_tutorial_7_submit($form, &amp;$form_state) {
  drupal_set_message(t('The form has been submitted. name="@first @last", year of birth=@year_of_birth', 
    array('@first' =&gt; $form_state['values']['first'], '@last' =&gt; $form_state['values']['last'], '@year_of_birth' =&gt; $form_state['values']['year_of_birth'])));
}


Of course, you can also show messages like this in the validation step. You would need to change above code to use whatever variables you want shown.  

Tons of very helpful form api code examples here.

If videos are more your thing, these explains the basic basics ok. 

Cheers!