Oracle 唯一 约束(unique constraint) 与 索引(index) 关系说明
摘要:
一. 官网对Unique Constraints说明http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/datainte.htm#CNCPT1642 uniquekey constraint requires that every value in a column or set of columns beunique. No rows of a table may have duplicate values in a column (the uniquekey) or set of columns (the compo 阅读全文
posted @ 2011-07-13 21:42 spring3mvc学习笔记 阅读(311) 评论(0) 推荐(0) 编辑