How to find out the NULL columns in the table?

Question

Hi,
Please provide the query to find the null columns in the table. Here, all rows in the table have same column as null. It won't change.
Table
c1 c2 c3 c4
X C 10
T D 20
I wanna find out as C2 is the nullable column.
Thanks in advance !!
Regards,
Vissu....

Answer 1

Below code might be solution for finding NULL valued in columns in a table and if it is solution .kindly give me points for the same.
declare
cursor col_cur is
select column_name
from user_tab_cols -- all_tables can also be used in case the table is present in own schema
where table_name = 'TABLE_NAME'; --provide the TABLE_NAME  
stmt varchar2(1000):= '';
v_count number;
count_null number;
begin
execute immediate 'select count(*) from TABLE_NAME' into v_count; --provide the TABLE_NAME  
for rec in col_cur loop
execute immediate 'select count(*) from TABLE_NAME' where --provide the TABLE_NAME  
'||rec.column_name||' IS NULL' into count_null;
if count_null = v_count then
stmt :=stmt|| rec.column_name ||chr(13);
end if;
end loop;
dbms_output.put_line(stmt);
end ;