php - How to return unknown value using known value from same column in SQL -

i have form submits email address, name , image plus few more fields. submissions stored in same column named sentvalue each form field's unique name in column formfield.

first time submissions require fields returning users need enter email , form returns image upload because found email address in db.

i want use known value of fieldname 'email' return it's matching 'name' value fieldname 'name' , print page image upload.

this without correct logic , have attempted numerous other formats , sql syntax

select sentvalue name tbl_submission  formid='2' , formfield='name'  , formfield='email' , sentvalue='smit@home.com' return $query; 

what correct sql query achieve goal?

@matt structure
tbl_submission
formid - because multiple forms post table , each has id
formsubsid - each field's data gets id on db entry
formfield - stores unique name of each field
sentvalue - stores value of each field entered user

|formid|formsubsid|formfield|sentvalue| |  1   |   1      | name    | mike    | |  1   |   1      | email   |mi@hom.us| |  1   |   1      | image   |img.jpg  | |  2   |   34     | image   |new.jpg  |         

the first page user sees has form single email text field. entry not stored in db formid 1 in db queried on submission see if entered email exists. if not, form id 1 showing required fields returned.

if query returns true email in db, yet different form id 2 returned displays single image upload field , image stored in same sentvalue col. on page want name associated found email, printed.

if understand correctly, need find possible name same formsubsid email 'mi@hom.us'. can using simple left join, since name may possibly not exist;

select name.sentvalue name  tbl_submission email left join tbl_submission name    on email.formsubsid = name.formsubsid , name.formfield = 'name' email.formfield = 'email' , email.sentvalue = 'mi@hom.us' 

this return name, or null if no name exists. if instead want no result @ if name doesn't exist, can change left join regular join.

an sqlfiddle test with.