compare two sql database tabular data c# or java

hello i'm searching for a fast method for transform a tabular data to an opencl buffer or texture.
I use c# and i select two table.
Now i can use datatable.net class or a cursor in java or c#.
then what is a fast method for transform this tabular data to a buffer or texture?
Because i must compare char to char these data and return where are the difference and all this in opencl.
I have some doubt for the fields . how opencl kernel can find in what field is the compare?
I can use  a transcode bufffer?
can you help me ?
this can be useful also for other user.
thanks