解决问题的场景
用户表里有很多IP地址,要求将表里所有IP地址分类到相应的IP端内,并求数量
利用T-SQL 进行定义相应的函数
create function dbo.fn_IP(@ip varchar(15)) returns bigint begin return parsename(@ip,4)*cast(16777216 as bigint)+parsename(@ip,3)*65536+parsename(@ip,2)*256+parsename(@ip,1) end declare @tb table (id int,ip varchar(15)) insert @tb select 1,'10.210.128.207' UNION ALL select 2,'10.210.128.206' UNION ALL select 3,'10.210.128.205' UNION ALL select 4,'10.210.128.204' UNION ALL select 5,'10.210.128.203' UNION ALL select 6,'10.210.128.202' UNION ALL select 7,'10.210.128.201' select id,ip,dbo.fn_IP(ip) from @tb where dbo.fn_IP(ip) between dbo.fn_IP('10.210.128.203') and dbo.fn_IP('10.210.128.205')