Вы можете создать представление:
CREATE VIEW innerb_comma AS
SELECT CONCAT(Pcode, ',') AS Pcode,
CONCAT(Brand, ',') AS Brand,
CONCAT(Pdescription, ',') AS Pdescription,
CONCAT(Size, ',') AS Size,
CONCAT(Barcode, ',') AS Barcode
FROM innerb
WHERE NOT EXISTS (SELECT * FROM wms WHERE barcode = innerb.barcode)
AND Pcode like '%102';
Затем выберите вместо этого:
SELECT * FROM innerb_comma
Демонстрация на dbfiddle