avoid redundant data during import

[黄祥]

e.g.
on tables employee
id = 1
name = edy

position = staff

on employee.csv
name,position

erick,staff

edy,staff

jack,manager

expected result on table employee

id = 1
name = edy

position = staff

id = 2
name = erick

position = staff

id = 3
name = jack

position = manager

is there any way to avoid redundant data during import ?

thanks and best regards,

stifan