Oracle中nvl()和nvl2()函数实例
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数据库教程:Oracle中nvl()和nvl2()函数实例详解
oracle中nvl()与nvl2()函数详解:函数nvl(expression1,expression2)根据参数1是否为null返回参数1或参数2的值;函数nvl2(expression1,exp
oracle中nvl()与nvl2()函数详解:函数nvl(expression1,expression2)根据参数1是否为null返回参数1或参数2的值;函数nvl2(expression1,exp