Extracting similar data from a dynamic set of tables

Question

I want to select common fields from an arbitrary set of tables, adding an extra field that is the table name, and return all of these rows in a single table. I know the steps but I am getting bogged down in the details (being new to Oracle):
--Create a temporary table.
--Generate a dynamic SQL statement to grab the data for each table of interest.
--Execute that query and store the results in the temporary table.
--Output the entire temporary table and delete it.
Here is my latest attempt:
================
Create global temporary table myTempTable
     Title varchar2(30),
     IdType number(8),
     Count number(8)
) on commit delete rows;
declare
sql_stmt VARCHAR2(200);
tname VARCHAR2(30);
begin
for tname in (
select distinct table_name from sys.ALL_TAB_COLS
          where owner='me' and table_name like '%ASSIGNS'
loop
sql_stmt :=
'insert into myTempTable(Title, IdType, Count) ' ||
     'select '':1'', IdType, count(*) from me.:1 group by IdType';
EXECUTE IMMEDIATE sql_stmt USING tname;
end loop;
select * from myTempTable;
commit; -- to delete the temp table
end;
================
The error messages are:
--expressions have to be of SQL types
--an INTO clause is expected in this SELECT statement
What am I missing here?

Answer 1

(1) First of all I am executing the whole script in SQL*Plus, thats why I use SQL*Plus command like the SLASH Operator.
<br>
(2)
SQL> VAR cur refcursor
SQL> CREATE TABLE mytemptable AS SELECT ename table_name, deptno idtype, sal cnt FROM emp WHERE 1=0
Table created.
SQL> DECLARE
   sql_stmt   VARCHAR2 (200);
   tname      VARCHAR2 (30);
BEGIN
   FOR tname IN (SELECT DISTINCT table_name
                            FROM SYS.all_tab_cols
                           WHERE owner = USER AND table_name LIKE '%EMP')
   LOOP
      sql_stmt :=
            'insert into myTempTable select '''
         || tname.table_name
         || ''' table_name, deptno IdType, count(*) cnt from '
         || tname.table_name
         || ' group by deptno';
      EXECUTE IMMEDIATE sql_stmt;
   END LOOP;
   OPEN :cur FOR
      SELECT *
        FROM mytemptable;
   EXECUTE IMMEDIATE 'drop table myTempTable';
END;
PL/SQL procedure successfully completed.
SQL> PRINT :cur
TABLE_NAME     IDTYPE        CNT
EMP                10          3
EMP                20          5
EMP                30          6
3 rows selected.Since we DROP the table at the end we don't need an explicit commit, since all DDL statement will implicitly commit anyway.