Problem Model database record find data other table

Hi, friends

i new in codeigniter.

i are work framework scriptcase and php blank.

i have problem in use codeigniter

My case

 i have table  n campos for example write 3

table 1
itemid  colorsactive coste
1           A/B/C/D       1

table 2
itemid colorname
1           A
1           B
1           C
1           D 

i have view datatable. perfect

i need view in field colorsactive for record all options the other table.