First normal form (1NF), Second normal form (2NF) and the Third Normal Form (3NF) was introduced by Edgar F. Codd, who is also the inventor of the relational model and the concept of normalization.
ຮູບແບບປົກກະຕິ ທໍາ ອິດ (1NF), ຮູບແບບປົກກະຕິທີສອງ (2NF) ແລະແບບຟອມປົກກະຕິທີສາມ (3NF) ໄດ້ຖືກ ນໍາ ສະ ເຫນີ ໂດຍ Edgar F. Codd, ເຊິ່ງຍັງເປັນຜູ້ປະດິດສ້າງຮູບແບບການພົວພັນແລະແນວຄິດຂອງການເຮັດວຽກປົກກະຕິ.