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sql 表值函数与标量值函数

http://www.cnblogs.com/xlhblogs/archive/2012/02/15/2352196.html

http://blog.csdn.net/dongxiaohui2008/article/details/8001141

SQL Server中存储过程与函数的区别

http://database.ctocio.com.cn/304/9355304.shtml

http://www.cnblogs.com/Joetao/articles/2250516.html

聚集索引由于特性不可以创建为覆盖索引

http://zhidao.baidu.com/link?url=j6d9_3DvNuRwBZ8djrQ9vpCp2nY4eb7c5x_RpxX0myFS6sIr8EtxIfqifS4R-5OFmW5ShwGCljcnj5tJ64HqHq

http://www.jb51.net/article/23952.htm

http://blog.csdn.net/lovehongyun/article/details/2031260

http://zhidao.baidu.com/link?url=jYvlj5N4i8l26f2wJlVJaDd13NnvMtDvbj8hBYttzOCp14EdKQQYQJi8rx33xoPGSdph7_n-MisglXcX-PWdmBasKRTg4qGIpez2coOg6NK