本文實(shí)例匯總了Oracle實(shí)現(xiàn)分頁查詢的SQL語法，整理給大家供大家參考之用，詳情如下：
1.無ORDER BY排序的寫法。(效率最高)
經(jīng)過測試，此方法成本最低，只嵌套一層，速度最快！即使查詢的數(shù)據(jù)量再大，也幾乎不受影響，速度依然！
sql語句如下：
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SELECT * FROM (Select ROWNUM AS ROWNO, T.* from k_task T where Flight_date between to_date('20060501', 'yyyymmdd') and to_date('20060731', 'yyyymmdd') AND ROWNUM <= 20) TABLE_ALIASWHERE TABLE_ALIAS.ROWNO >= 10; |
2.有ORDER BY排序的寫法。(效率最高)
經(jīng)過測試，此方法隨著查詢范圍的擴(kuò)大，速度也會(huì)越來越慢！
sql語句如下：
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SELECT * FROM (SELECT TT.*, ROWNUM AS ROWNO FROM (Select t.* from k_task T where flight_date between to_date('20060501', 'yyyymmdd') and to_date('20060531', 'yyyymmdd') ORDER BY FACT_UP_TIME, flight_no) TT WHERE ROWNUM <= 20) TABLE_ALIASwhere TABLE_ALIAS.rowno >= 10; |
3.無ORDER BY排序的寫法。(建議使用方法1代替)
此方法隨著查詢數(shù)據(jù)量的擴(kuò)張，速度會(huì)越來越慢！
sql語句如下：
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SELECT * FROM (Select ROWNUM AS ROWNO, T.* from k_task T where Flight_date between to_date('20060501', 'yyyymmdd') and to_date('20060731', 'yyyymmdd')) TABLE_ALIASWHERE TABLE_ALIAS.ROWNO <= 20 AND TABLE_ALIAS.ROWNO >= 10;TABLE_ALIAS.ROWNO between 10 and 100; |
4.有ORDER BY排序的寫法.(建議使用方法2代替)
此方法隨著查詢范圍的擴(kuò)大，速度也會(huì)越來越慢！
sql語句如下：
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SELECT * FROM (SELECT TT.*, ROWNUM AS ROWNO FROM (Select * from k_task T where flight_date between to_date('20060501', 'yyyymmdd') and to_date('20060531', 'yyyymmdd') ORDER BY FACT_UP_TIME, flight_no) TT) TABLE_ALIASwhere TABLE_ALIAS.rowno BETWEEN 10 AND 20; |
5.另類語法。(有ORDER BY寫法）
該語法風(fēng)格與傳統(tǒng)的SQL語法不同，不方便閱讀與理解，為規(guī)范與統(tǒng)一標(biāo)準(zhǔn)，不推薦使用。此處貼出代碼供大家參考之用。
sql語句如下：
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With partdata as( SELECT ROWNUM AS ROWNO, TT.* FROM (Select * from k_task T where flight_date between to_date('20060501', 'yyyymmdd') and to_date('20060531', 'yyyymmdd') ORDER BY FACT_UP_TIME, flight_no) TT WHERE ROWNUM <= 20) Select * from partdata where rowno >= 10; |
6.另類語法 。(無ORDER BY寫法）
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With partdata as( Select ROWNUM AS ROWNO, T.* From K_task T where Flight_date between to_date('20060501', 'yyyymmdd') and To_date('20060531', 'yyyymmdd') AND ROWNUM <= 20) Select * from partdata where Rowno >= 10; |
相信本文所述代碼能夠?qū)Υ蠹矣幸欢ǖ膮⒖冀梃b價(jià)值。
