nak tnye psl database cakephp....hope leh tlg..

salam sumer..
sy org bru gak kt cni dan nk tnye psl cakephp..

ade problem nak design database tuk cakephp. xpaham sgt. nape setiap table msti kne ade id as pk. cmne nk wat relationship klu pk sumer sama???

skrg ni nak wat tuk system admin and assessment..
idea tuk table like below.

system admin ade 2table : 1. table Users 2. table courses

assessment lak ade 3 table : 1. table Assessments 2. table Questions 3. table Answers

kne tmbah table lain ke???
klu gabung system admin ngn assessment ni bleh x??
sori, sy bru lg dlm bidang ni. ni pn sbb nk wat projek...

mohon sape yang expert dlm cakephp tlg perbetulkn klu ade yg terkurang...