PLS-00497: cannot mix between single row and multi-row (BULK) in INTO list - oracle

Question

I have created a procure to display the data in two table using BULK COLLECT, but i keep getting this error.
PLS-00497: cannot mix between single row and multi-row (BULK) in INTO list
However it works if i remove the BULK COLLECT and include a where clause in the statement.
create or replace PROCEDURE sktReport IS
TYPE inventory_table_type is RECORD (
v_WH_ID INVENTORY.WH_ID%TYPE,
v_wa_Product_quantity_id Product_quantity.ST_ID%TYPE);
v_inventory_table inventory_table_type;
BEGIN
SELECT INVENTORY.WH_ID, Product_quantity.ST_ID,
BULK COLLECT INTO
v_inventory_table.v_WH_ID,
v_inventory_table.v_wa_Product_quantity_id,
FROM INVENTORY
INNER JOIN Product_quantity
ON Product_quantity.ST_ID = INVENTORY.ST_ID;
FOR i IN v_inventory_table.v_WH_ID..v_inventory_table.v_WH_ID
LOOP
DBMS_OUTPUT.PUT_LINE ('ID : ' || v_inventory_table.v_WH_ID
|| ' quantity ID : ' || v_inventory_table.v_in_Product_quantity_id);
END LOOP;
END;

Answer 1

Here's a simple showcase, I've just written that might help you :)
SET SERVEROUTPUT ON;
DECLARE
TYPE t_some_type IS RECORD (
the_id NUMBER
,the_name VARCHAR2(1)
);
TYPE t_some_type_tab IS TABLE OF t_some_type;
lt_some_record t_some_type;
lt_some_array t_some_type_tab := NEW t_some_type_tab();
BEGIN
WITH some_values AS (
SELECT
DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
FROM
dual
CONNECT BY LEVEL < 5
)
SELECT
sv.the_id
,sv.the_name
BULK COLLECT INTO -- use this to select into an array/collection type variable
lt_some_array
FROM
some_values sv;
DBMS_OUTPUT.PUT_LINE(lt_some_array.COUNT);
WITH some_values AS (
SELECT
DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
FROM
dual
CONNECT BY LEVEL < 5
)
SELECT
sv.the_id
,sv.the_name
INTO -- use this to select into a regular variables
lt_some_record.the_id
,lt_some_record.the_name
FROM
some_values sv
WHERE
sv.the_id = 1;
DBMS_OUTPUT.PUT_LINE(lt_some_record.the_id||': '||lt_some_record.the_name);
-- you can also insert such record into your array type variable
lt_some_array := NEW t_some_type_tab();
lt_some_array.EXTEND; -- extend the array type variable (so it could store one more element, than now - which was 0)
lt_some_array(lt_some_array.LAST) := lt_some_record; -- assign the first element of array type variable
DBMS_OUTPUT.PUT_LINE(lt_some_array.COUNT||' '||lt_some_array(lt_some_array.LAST).the_id||': '||lt_some_array(lt_some_array.LAST).the_name);
END;
/
Also, since you want to iterate through your results, you can just use cursor (implicit or explicit) e.g.
DECLARE
-- cursor declaration
CURSOR c_some_cursor IS
WITH some_values AS (
SELECT
DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
FROM
dual
CONNECT BY LEVEL < 5
)
SELECT
sv.the_id
,sv.the_name
FROM
some_values sv;
BEGIN
-- using explicit, earlier declared cursor
FOR c_val IN c_some_cursor
LOOP
DBMS_OUTPUT.PUT_LINE(c_val.the_id||': '||c_val.the_name);
END LOOP;
-- using implicit, not declared cursor
FOR c_val IN (
WITH some_values AS (
SELECT
DECODE(LEVEL,1,1,2,2,3,3,4,4) AS the_id
,DECODE(LEVEL,1,'A',2,'B',3,'C',4,'D') AS the_name
FROM
dual
CONNECT BY LEVEL < 5
)
SELECT
sv.the_id
,sv.the_name
FROM
some_values sv
)
LOOP
DBMS_OUTPUT.PUT_LINE(c_val.the_id||': '||c_val.the_name);
END LOOP;
END;
/

Answer 2

Here i have demonstrated a simple example to replicate your scenario. Please see below code. This may help you out.
SET serveroutput ON;
DECLARE
TYPE AV_TEST
IS
RECORD
(
lv_att1 PLS_INTEGER,
lv_att2 PLS_INTEGER );
type av_test_tab
IS
TABLE OF av_test;
av_test_tab_av av_test_tab;
BEGIN
NULL;
SELECT LEVEL,
LEVEL+1 BULK COLLECT
INTO av_test_tab_av
FROM DUAL
CONNECT BY LEVEL < 10;
dbms_output.put_line(av_test_tab_av.count);
FOR I IN av_test_tab_av.FIRST..av_test_tab_av.LAST
LOOP
dbms_output.put_line('working fine '||av_test_tab_av(i).lv_att1||' '||av_test_tab_av(i).lv_att2);
END LOOP;
END;