Oracle error when selecting into temp table - oracle

Question

My ultimate goal is far more complex than this, but this is the cut down version of what is causing my error. I want to put some rows into a temporary table (actually several temp tables, but I can't get by this first hurdle). Here is my PL/SQL;
DECLARE
type L1_store is table of MyTable%rowtype;
L1 L1_store;
BEGIN
select
* bulk collect
into L1
from MyTable
WHERE 1=1
and length(MyColumn1) = 2;
select
L1.MyColumn1
,L1.MyColumn2
from L1;
END;
And here is the error I get;
ORA-06550: line 19, column 6:
PL/SQL: ORA-00942: table or view does not exist
ORA-06550: line 16, column 1:
PL/SQL: SQL Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:
The line numbers may be incorrect as I have edited the actual PL/SQL for clarity
****EDIT****
OK, so I originally accepted the answer offered below as it looks like it answers my question, and I can see how I could use it. However, for clarity, here is my ultimate goal, in case there is a better answer than the one I have in my head.
If I was just doing this in SQL I would do something like;
with L1 as
(select * from table),
L2 as
(select * from anothertable)
select L1.Column
from L1
left join L2 on L1.somecolumn = L2.somecolumn
I don't know if this helps or hinders, but thanks all in anticipation of your continued patience.

Answer 1

type L1_store is table of MyTable%rowtype; is not a temporary table; it is a collection data type declared in the PL/SQL scope and cannot be used in the SQL scope. Similarly, %ROWTYPE is a PL/SQL construct.
If you want to use a collection in SQL then declare it in the SQL scope:
CREATE TYPE mytable_data is OBJECT (
mycolumn1 VARCHAR2(50),
mycolumn2 NUMBER,
mycolumn3 DATE
);
CREATE TYPE mytable_data_table IS TABLE OF mytable_data;
so for some test data:
CREATE TABLE MyTable(
mycolumn1 VARCHAR2(50),
mycolumn2 NUMBER,
mycolumn3 DATE
);
INSERT INTO MyTable VALUES ( 'AA', 42, SYSDATE );
Then you can do:
DECLARE
L1 mytable_data_table;
BEGIN
select mytable_data( mycolumn1, mycolumn2, mycolumn3 )
bulk collect into L1
from MyTable
WHERE length(MyColumn1) = 2;
FOR i IN 1 .. L1.COUNT LOOP
DBMS_OUTPUT.PUT_LINE( L1(i).mycolumn1 || ' ' || l1(i).mycolumn2 );
END LOOP;
END;
/
Which outputs:
AA 42
db<>fiddle here

Answer 2

The problem here seems to be the second select in the block. If you're trying to select the data from the record, I would be inclined to put it into a FOR loop. I.e, something like this:
for i in 1 .. L1.count() LOOP
dbms_output.put_line (L1(i).MyColumn1);
end loop;
You could assign the value of MYColumn1 to a variable or use it in some other way.