Using RETURNING clause with Execute Immediate

Question

I wrote a query to update a table and return the column in to a nested table type variable using returning clause but its not working I am getting error like
ORA-06550: line 66, column 22:
PLS-00306: wrong number or types of arguments in call to '||'
ORA-06550: line 66, column 4:
PL/SQL: Statement ignored
I am getting error in following part of my query
|| 'RETURNING if_row_status bulk collect INTO '
|| v_if_row_status;
v_if_row_status is defined as -
TYPE v_count IS TABLE OF varchar2(50) INDEX BY BINARY_INTEGER;
v_if_row_status v_count;

Answer 1

I am trying to update a table for diffrent column if they are null and want no of column updated for each column.
I wrote following query but I am not getting the correct output.
UPDATE
Temp_Bulk_Col_POC
SET if_row_status = 'VALIDATED',
if_row_processed_date = sysdate,
if_row_error_msg =
CASE
WHEN record_type IS NULL
THEN 'RECORD_TYPE is a required column and cannot be NULL'
WHEN source_system IS NULL
THEN 'SOURCE_SYSTEM is a required column and cannot be NULL'
WHEN record_company IS NULL
THEN 'RECORD_COMPANY is a required column and cannot be NULL'
WHEN record_system IS NULL
THEN 'RECORD_SYSTEM is a required column and cannot be NULL'
WHEN txn_flag IS NULL
THEN 'TXN_FLAG is a required column and cannot be NULL'
WHEN create_date IS NULL
THEN 'CREATE_DATE is a required column and cannot be NULL'
WHEN UPDATE_date IS NULL
THEN 'UPDATE_DATE is a required column and cannot be NULL'
WHEN source_customer_id IS NULL
THEN 'SOURCE_CUSTOMER_ID is a required column and cannot be NULL'
WHEN source_product_id IS NULL
THEN 'SOURCE_PRODUCT_ID is a required column and cannot be NULL'
WHEN az_product_id IS NULL
THEN 'AZ_PRODUCT_ID is a required column and cannot be NULL'
WHEN decile IS NULL
THEN 'DECILE is a required column and cannot be NULL'
END
WHERE if_row_status IS NULL
AND (record_type IS NULL
OR source_system IS NULL
OR record_company IS NULL
OR record_system IS NULL
OR txn_flag IS NULL
OR create_date IS NULL
OR UPDATE_date IS NULL
OR source_customer_id IS NULL
OR source_product_id IS NULL
OR az_product_id IS NULL
OR decile IS NULL)
RETURNING if_row_status,record_type,source_system,record_company,record_system,
txn_flag,create_date,UPDATE_date,source_customer_id,source_product_id,az_product_id,
decile
BULK COLLECT INTO
v_if_row_status,v_record_type,v_source_system,
v_record_company,v_record_system,v_txn_flag,v_create_date,v_UPDATE_date,
v_source_customer_id,v_source_product_id,v_az_product_id,v_decile;
its showing same number for all the column.
how I can collect based on the coulmn updated