TY - JFULL AU - L. Ludovic and R. Daniel and S-E Tbahriti PY - 2007/3/ TI - Towards an Extended SQLf: Bipolar Query Language with Preferences T2 - International Journal of Computer and Information Engineering SP - 362 EP - 368 VL - 1 SN - 1307-6892 UR - https://publications.waset.org/pdf/11600 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 2, 2007 N2 - Database management systems that integrate user preferences promise better solution for personalization, greater flexibility and higher quality of query responses. This paper presents a tentative work that studies and investigates approaches to express user preferences in queries. We sketch an extend capabilities of SQLf language that uses the fuzzy set theory in order to define the user preferences. For that, two essential points are considered: the first concerns the expression of user preferences in SQLf by so-called fuzzy commensurable predicates set. The second concerns the bipolar way in which these user preferences are expressed on mandatory and/or optional preferences. ER -