求语句！从第几行取几行的语句！解决思路

CREATE PROC sp_PageView 
 @tbname   sysname,       	--要分页显示的表名 
 @FieldKey   nvarchar(1000),  	--用于定位记录的主键(惟一键)字段,可以是逗号分隔的多个字段 
 @PageCurrent int=1,       	--要显示的页码 
 @PageSize   int=10,      	--每页的大小(记录数) 
 @FieldShow nvarchar(1000)='',  	--以逗号分隔的要显示的字段列表,如果不指定,则显示所有字段 
 @FieldOrder nvarchar(1000)='',  	--以逗号分隔的排序字段列表,可以指定在字段后面指定DESC/ASC 
                     用于指定排序顺序 
 @Where  nvarchar(1000)='', 	--查询条件 
 @PageCount int OUTPUT     	--总页数 
 AS 
 SET NOCOUNT ON 
 --检查对象是否有效 
 IF OBJECT_ID(@tbname) IS NULL 
 BEGIN 
 	RAISERROR(N'对象"%s"不存在',1,16,@tbname) 
 	RETURN 
 END 
 IF OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsTable')=0 
 	AND OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsView')=0 
 	AND OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsTableFunction')=0 
 BEGIN 
 	RAISERROR(N'"%s"不是表、视图或者表值函数',1,16,@tbname) 
 	RETURN 
 END 
  
 --分页字段检查 
 IF ISNULL(@FieldKey,N'')='' 
 BEGIN 
 	RAISERROR(N'分页处理需要主键（或者惟一键）',1,16) 
 	RETURN 
 END 
  
 --其他参数检查及规范 
 IF ISNULL(@PageCurrent,0) <1 SET @PageCurrent=1 
 IF ISNULL(@PageSize,0) <1 SET @PageSize=10 
 IF ISNULL(@FieldShow,N'')=N'' SET @FieldShow=N'*' 
 IF ISNULL(@FieldOrder,N'')=N'' 
 	SET @FieldOrder=N'' 
 ELSE 
 	SET @FieldOrder=N'ORDER BY '+LTRIM(@FieldOrder) 
 IF ISNULL(@Where,N'')=N'' 
 	SET @Where=N'' 
 ELSE 
 	SET @Where=N'WHERE ('[email protected]+N')' 
  
 [email protected],则计算总页数(这样设计可以只在第一次计算总页数,以后调用时,把总页数传回给存储过程,避免再次计算总页数,对于不想计算总页数的处理而言,[email protected]) 
 IF @PageCount IS NULL 
 BEGIN 
 	DECLARE @sql nvarchar(4000) 
 	SET @sql=N'SELECT @PageCount=COUNT(*)' 
 		+N' FROM '[email protected] 
 		+N' '[email protected] 
 	EXEC sp_executesql @sql,N'@PageCount int OUTPUT',@PageCount OUTPUT 
 	SET @PageCount=(@[email protected])[email protected] 
 END 
  
 --计算分页显示的TOPN值 
 DECLARE @TopN varchar(20),@TopN1 varchar(20) 
 SELECT @[email protected], 
 	@TopN1=(@PageCurrent-1)[email protected] 
  
 --第一页直接显示 
 IF @PageCurrent=1 
 	EXEC(N'SELECT TOP '[email protected] 
 		+N' '[email protected] 
 		+N' FROM '[email protected] 
 		+N' '[email protected] 
 		+N' '[email protected]) 
 ELSE 
 BEGIN 
 	--处理别名 
 	IF @FieldShow=N'*' 
 		SET @FieldShow=N'a.*' 
  
 	--生成主键(惟一键)处理条件 
 	DECLARE @Where1 nvarchar(4000),@Where2 nvarchar(4000), 
 		@s nvarchar(1000),@Field sysname 
 	SELECT @Where1=N'',@Where2=N'',@[email protected] 
 	WHILE CHARINDEX(N',',@s)>0 
 		SELECT @Field=LEFT(@s,CHARINDEX(N',',@s)-1), 
 			@s=STUFF(@s,1,CHARINDEX(N',',@s),N''), 
 			@[email protected]+N' AND a.'[email protected]+N'=b.'[email protected], 
 			@[email protected]+N' AND b.'[email protected]+N' IS NULL', 
 			@Where=REPLACE(@Where,@Field,N'a.'[email protected]), 
 			@FieldOrder=REPLACE(@FieldOrder,@Field,N'a.'[email protected]), 
 			@FieldShow=REPLACE(@FieldShow,@Field,N'a.'[email protected]) 
 	SELECT @Where=REPLACE(@Where,@s,N'a.'[email protected]), 
 		@FieldOrder=REPLACE(@FieldOrder,@s,N'a.'[email protected]), 
 		@FieldShow=REPLACE(@FieldShow,@s,N'a.'[email protected]), 
 		@Where1=STUFF(@Where1+N' AND a.'[email protected]+N'=b.'[email protected],1,5,N''),