/*
* firstindex:起始索引
* pagesize:每頁顯示的數量
* sql:可以是簡單的單錶查詢語句，也可以是複雜的多表聯合查詢語句
*/select * from(select a.*,rownum rn from(sql) a where rownum<=(firstindex+pagesize)) where rn>firstindex
* firstindex:起始索引
* pagesize:每頁顯示的數量
* ordercolumn:排序的欄位名
* sql:可以是簡單的單錶查詢語句，也可以是複雜的多表聯合查詢語句
*/select * from(select * from(select t.*,row_number() over(order
by ordercolumn) as rownumber from(sql) t) p where p.rownumber>firstindex) where rownum<=pagesize
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