本文将介绍Microsoft SQL Server 2000的新增特性—用户自定义函数User-Defined Function(UDF),并演示几个常用的实例。 UDF的功能类似SQL Server中内建的系统函数,如CONVERT、SUBSTRING、 DATAADD、 GETDATA、ISNULL等等。一个UDF可以没有参数,或者带有一个或多个参数,函数运行后 ...
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