oracle分頁不像mysql和sqlserver那麼簡單，mysql有limit函式可以實現分頁，sqlserver有top關鍵字可以分頁，oracle沒有類似函式或關鍵字，必須借助偽列rownum
總體思路是，從第幾行開始查詢，要查詢多少頁，分頁查詢語句如下：
每頁顯示10條分頁
select * from(
select rownum rm, t.* from t_user t
) tm where rm > 10 and rm <= 20
換成**形式
select * from(
select rownum rm, t.* from t_user t
) tm where rm > pagesize * ( pagenow - 1 ) and rm <= pagesize * pagenow
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