Back end testing is nothing but Database testing , when u
fire a sql query the data in a table should display.in front
end u can see in search screen or summary screen ,whether
the data is pulling from correct table or columns, In heath
care industry  u may have ICD codes ex: for brain injury one
code will be there for broken leg on code ,check with entity
models u can understand better

bayana.praveeen reddy

Data Integrity and Data Validaty Testing is called Data 
base testing.

Allong with this you need to test the Stored procudrues 
also where right paramaeters and Operation requires are 
sent ... 

and also you need to write simple select quires to check.