I'm having a really annoying SQL problem which I think (or hope) can easily be sorted but I'm not sure how to do it. I have a ZPT which is collecting data in a form - Both text boxes and checkboxes. The form then passes the variables on to a DTML Method which does a few bits of error checking then calls an Z SQL Method to insert the data. If all of the data is completed (i.e. each textbox and checkbox is ticked) then the form inserts the data exactly as it should. If not all checkboxes are ticked the page returns an error - This is due to the SQL Method trying to insert data which hasnt been passed to it. Below is my SQL Method: INSERT choices (userid, datetime, course, name, core1, core2, core3, core4, core5, choice1, choice2, choice3, choice4) VALUES ( <dtml-sqlvar userid type=string>, <dtml-sqlvar datetime type=string>, <dtml-sqlvar course type=string>, <dtml-sqlvar name type=string>, <dtml-sqlvar core1 type=string>, <dtml-sqlvar core2 type=string>, <dtml-sqlvar core3 type=string>, <dtml-sqlvar core4 type=string>, <dtml-sqlvar core5 type=string>, <dtml-sqlvar choice1 type=string optional>, <dtml-sqlvar choice2 type=string optional>, <dtml-sqlvar choice3 type=string optional>, <dtml-sqlvar choice4 type=string optional> ) Arguments are: userid datetime course name core1 core2 core3 core4 core5 choice1 choice2 choice3 choice4 Note: Choice1-4 are checkboxes and every other item is a textbox. Please help - Its doing my head in! Cheers and all the best Phil