[Koha] Regarding the author entered in 700$a tag

[Sahadeo Taware]

Dear Friends

I want a simple report in which I want Acc. No., Title, Author, Publisher
and Co-Authors
I entered the co-authors in 700$a tag but there is no koha mapping in this
field, How can I extract value from 700$a tag

Can u please send me the sql query for the same
-
Sahadeo D. Taware
Librarian, M.L.I.Sc., NET
Thakur College of Science and Commerce
Thakur Village, Kandivli(E), Mumbai 400101
Mob. No 9324912816