Error while data shifting from one table to another table

Question

i have two tables.
in one table i dont have constraints.in anothe rtable i have constraints.
my requiremnt is i have to shift data from unconstrained table to constrained table
while shifting data any constaint violation is there system hasto raise error by specifying the error
in below example it should be ename,esal values not null.
i tried with save exception but it gives only error.i want error by mentiong that column names also ie ename,esal is not null
if ename value only null then it should be give ename is null
create table tablea (eno number(10), ename varchar2(20) not null, esal number(5) not null)
create table tabl (eno number(10), ename varchar2(20) , esal number(5) )
DECLARE
TYPE tabl_tab IS TABLE OF tabl%rowTYPE;
tab tabl_tab;
-- create an exception handler for ORA-24381
ERRORS NUMBER;
dml_errors EXCEPTION;
PRAGMA EXCEPTION_INIT (dml_errors, -24381);
BEGIN
SELECT *
BULK COLLECT INTO tab
FROM tabl
WHERE rownum<=2;
-- add '_SR' to the job_id of the most senior employees
FORALL i IN tab.FIRST .. tab.LAST SAVE EXCEPTIONS
insert into tablea values tab(i);
EXCEPTION
WHEN dml_errors
THEN
rollback ; --roll backs all the good records updation
-- Now we figure out what failed and why.
ERRORS := SQL%BULK_EXCEPTIONS.COUNT;
DBMS_OUTPUT.put_line ('Number of statements that failed: ' || ERRORS);
FOR i IN 1 .. ERRORS
LOOP
DBMS_OUTPUT.put_line ( 'Error #'
|| i
|| ' occurred during '
|| 'iteration #'
|| SQL%BULK_EXCEPTIONS (i).ERROR_INDEX
DBMS_OUTPUT.put_line ( 'Error message is '
|| SQLERRM
(-SQL%BULK_EXCEPTIONS (i).ERROR_CODE)
END LOOP;
END;
how to implement that.

Answer 1

it should give error as ename column is not null