说明：  oracle函数大全 是学习oracle数据库编程知识中必用到的材料。每个程序都要用到函数，对于初学者来说，不了解函数的可以到这个材料中来查找
(Daquan is a learning function oracle oracle database programming knowledge will be used in the material. Each program must use the function, for beginners, do not understand the function can go to find this material)