Select column names whose entries are not null

Question

I would like to have a list of those columns of a table that have at least one non-NULL data entries in them.

In other words, I would like to get the co

Answer 1

Use this procedure this will print columns names of a table which have atleast one not null rows.

create or replace procedure list_col_notNull(tblName in varchar2)
as
lv_col_name varchar2(200);
lv_ctr number;
lv_sql varchar2(400);
CURSOR cur_col_name is
SELECT column_name
FROM USER_TAB_COLUMNS U
WHERE table_name = tblName order by column_name asc;
begin
open cur_col_name;

LOOP
    FETCH cur_col_name INTO lv_col_name; 
    EXIT WHEN cur_col_name%NOTFOUND; 
    lv_sql := 'select count(1) From ' || tblName || ' where ' || lv_col_name || ' is not null'  ;  
    EXECUTE IMMEDIATE lv_sql into lv_ctr;
    if lv_ctr > 0
    then
        dbms_output.put_line(lv_col_name);
    end if;