Concatenating

Question

I have a table (test3) with 77 columns and I want to do a count of not null values for each column, to something like:
select count(*), upper(a4) "caller type", (select a11 from test3 where id = 1) "transaction name" from (
select a4 from test3 where a11 is not null and id <> 1)
group by upper(a4)
Because I dont want to change the above query and run it 77 times for each column, I created the following loop:
BEGIN
FOR loop_count IN 11 .. 77
LOOP
     INSERT INTO request2 (count, caller_type, trans_name)
select count(*) "count", upper(a4) "caller_type" ,(select 'a' || loop_count from test3 where id = 1) "trans_name" from (
select a4 from test3 where 'a' || loop_count is not null and id <> 1)
group by upper(a4);
     end loop;
END;
But when I run this query, I get "A" invalid identifier error. Can somebody help?

Answer 1

This maybe:
BEGIN
   FOR c IN
      (SELECT    'INSERT INTO request2 (count, caller_type, trans_name)
SELECT   COUNT (*),
         UPPER (a4) "caller type",
         (SELECT a'
              || ROWNUM
              || '
            FROM test3
           WHERE ID = 1) "transaction name"
    FROM (SELECT a4
            FROM test3
           WHERE a'
              || ROWNUM
              || ' IS NOT NULL AND ID <> 1)
GROUP BY UPPER (a4);' x
         FROM user_objects
        WHERE ROWNUM <= 77)
   LOOP
      EXECUTE IMMEDIATE c.x;
   END LOOP;
END;
SELECT *
  FROM request2;