This is good. There are lots of lists like this; you might find additional strings to add to it here:
https://code.google.com/p/fuzzdb/
Fuzz lists are to web pentesters what drain snakes are to plumbers.
Another good list that incorporates FuzzDB: https://github.com/danielmiessler/SecLists
As other commenters noted, strings like DROP TABLES should be used with caution!