Prevents the user to insert only the main block

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  Hello

  DECLARE
  CNT NUMBER (5): = 0;

  BEGIN

  Select "Chris" IN double's NTC;
  DBMS_OUTPUT. Put_line (to_char (CNT));

  EXCEPTION
  WHEN invalid_number CAN
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  CNT: = "deba";

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  END;

  First of all your exception mouhamadou who you have sent i.e. invalid_number itself does not.
  You should use named exception VALUE_ERROR to catch the exception in the main block.

  SQL> DECLARE
    2  cnt NUMBER(5):=0;
    3  BEGIN
    4  select 'debalina' INTO cnt from dual;
    5  DBMS_OUTPUT.PUT_LINE(to_char(cnt));
    6  EXCEPTION
    7  WHEN Invalid_number THEN
    8  DBMS_OUTPUT.PUT_LINE('error has occured inside main block');
    9  end;
   10  /
  DECLARE
  *
  ERROR at line 1:
  ORA-06502: PL/SQL: numeric or value error: character to number conversion error
  ORA-06512: at line 4
  
  SQL>  DECLARE
    2   cnt NUMBER(5):=0;
    3  BEGIN
    4  select 'debalina' INTO cnt from dual;
    5  DBMS_OUTPUT.PUT_LINE(to_char(cnt));
    6  EXCEPTION
    7  WHEN VALUE_ERROR THEN
    8  DBMS_OUTPUT.PUT_LINE('error has occured inside main block');
    9  end;
   10  /
  error has occured inside main block
  
  PL/SQL procedure successfully completed.
  

  Your doubts regarding catch the exception in the exception block, you can run as below, by nesting a block Begin in the exception block itself.

  SQL> DECLARE
    2  cnt NUMBER(35):=0;
    3  BEGIN
    4  select 'debalina' INTO cnt from dual;
    5  DBMS_OUTPUT.PUT_LINE(to_char(cnt));
    6  EXCEPTION
    7  WHEN Value_error THEN
    8  DBMS_OUTPUT.PUT_LINE('error has occured inside main block');
    9  Begin
   10  cnt:='deba';
   11  Exception
   12  WHEN OTHERS THEN
   13  DBMS_OUTPUT.PUT_LINE('error has occured inside exception block');
   14  End;
   15  END;
   16  /
  error has occured inside main block
  error has occured inside exception block
  
  PL/SQL procedure successfully completed.
  

  Hope your question is clear.
  :)
  Twinkle

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