Oracle pl/sql problem when trying to reference plsql table in query - oracle

Question

I am getting a pls-201 error when I try to reference a plsql table record in a query.
Here is an example of the issue:
DECLARE
TYPE trxtypeinforec IS RECORD(
NAME ra_cust_trx_types.NAME%TYPE
);
TYPE trxtypeinfotab IS TABLE OF trxtypeinforec
INDEX BY PLS_INTEGER;
g_inv_type trxtypeinfotab;
l_result VARCHAR2 (100);
BEGIN
g_inv_type(1).NAME := 'Test';
SELECT g_inv_type(qry.ID).NAME
INTO l_result
FROM (SELECT 1 ID
FROM dual) qry;
END;
Error report - ORA-06550: line 15, column 23: PLS-00201: identifier
'QRY.ID' must be declared ORA-06550: line 15, column 23: PLS-00201:
identifier 'QRY.ID' must be declared ORA-06550: line 15, column 12:
PL/SQL: ORA-00904: : invalid identifier ORA-06550: line 15, column 5:
PL/SQL: SQL Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:

Answer 1

Retrieve the index from the SELECT first into a local variable and then assign the value from the associative array to l_result in a PL/SQL scope and not in an SQL scope:
DECLARE
TYPE trxtypeinforec IS RECORD(
NAME ra_cust_trx_types.NAME%TYPE
);
TYPE trxtypeinfotab IS TABLE OF trxtypeinforec INDEX BY PLS_INTEGER;
g_inv_type trxtypeinfotab;
idx PLS_INTEGER;
l_result ra_cust_trx_types.NAME%TYPE;
BEGIN
g_inv_type(1).NAME := 'Test';
SELECT 1
INTO idx
FROM DUAL;
l_result := g_inv_type(idx).NAME;
DBMS_OUTPUT.PUT_LINE( l_result );
END;
/
Outputs:
Test
db<>fiddle here

Answer 2

Please try using a cursor.
SET SERVEROUTPUT ON;
DECLARE
TYPE trxtypeinforec IS RECORD(
NAME ra_cust_trx_types.NAME%TYPE
);
TYPE trxtypeinfotab IS TABLE OF trxtypeinforec
INDEX BY PLS_INTEGER;
g_inv_type trxtypeinfotab;
l_result VARCHAR2 (100);
-- Query for retrieving index goes in the cursor or use existing cursor
CURSOR cur_id IS
SELECT 1 AS ID FROM DUAL;
BEGIN
-- Populate records here or put inside loop as required
g_inv_type(1).NAME := 'Test';
-- Loop through the cursor to get the relevant index
FOR rec in cur_id
LOOP
SELECT g_inv_type(rec.ID).NAME
INTO l_result
FROM DUAL;
dbms_output.put_line (l_result);
END LOOP;
END;
/
It will be helpful if we could get some more information on how the existing cursor is fetching index values.
Output:
Test
PL/SQL procedure successfully completed.