Jarek Gryz Qiong Wang Xiaoyan Qian Calisto Zuzarte SQL Queries with CASE Expressions. 351-360 2008 ISMIS http://dx.doi.org/10.1007/978-3-540-68123-6_38 conf/ismis/2008 db/conf/ismis/ismis2008.html#GryzWQZ08