How to use group by in PL/SQL

Question

Can anyone give me a clue how to group rows using PL/SQL? I want to make a push button that groups a number of rows. When I run the form and push the button, I get the Oracle 01422 error. I am using one data block and, after pressing execute on the Oracle form in the web browser, I want to sort the rows using the group by clause as a pl sql trigger in a push button (with the WHEN BUTTON PRESSED trigger). I am new to Oracle Forms.

Answer 1

I managed to use a cursor to access and display each row. I have to press the command button I created once for access of each row individually. I want to be able to push the button once, and populate each row with a record from my table. I am using the tabular format. Here is my code:
DECLARE
     CURSOR email_message_cur
     IS
          SELECT sender, subject, body, date_time_sent
          FROM Email_Message
          ORDER BY sender;
BEGIN
     OPEN email_message_cur;
     FETCH email_message_cur
     INTO :GROUP_EMAIL_MESSAGE.SENDER, :GROUP_EMAIL_MESSAGE.SUBJECT, :GROUP_EMAIL_MESSAGE.BODY, :GROUP_EMAIL_MESSAGE.DATE_TIME_SENT;
     WHILE email_message_cur%FOUND LOOP
          IF :GROUP_EMAIL_MESSAGE.SENDER IS NOT NULL THEN
               CREATE_RECORD;
          END IF;
          FETCH email_message_cur INTO :GROUP_EMAIL_MESSAGE.SENDER, :GROUP_EMAIL_MESSAGE.SUBJECT, :GROUP_EMAIL_MESSAGE.BODY, :GROUP_EMAIL_MESSAGE.DATE_TIME_SENT;
     END LOOP;
     CLOSE email_message_cur;
END;