<ruby id="bdb3f"></ruby>

    <p id="bdb3f"><cite id="bdb3f"></cite></p>

      <p id="bdb3f"><cite id="bdb3f"><th id="bdb3f"></th></cite></p><p id="bdb3f"></p>
        <p id="bdb3f"><cite id="bdb3f"></cite></p>

          <pre id="bdb3f"></pre>
          <pre id="bdb3f"><del id="bdb3f"><thead id="bdb3f"></thead></del></pre>

          <ruby id="bdb3f"><mark id="bdb3f"></mark></ruby><ruby id="bdb3f"></ruby>
          <pre id="bdb3f"><pre id="bdb3f"><mark id="bdb3f"></mark></pre></pre><output id="bdb3f"></output><p id="bdb3f"></p><p id="bdb3f"></p>

          <pre id="bdb3f"><del id="bdb3f"><progress id="bdb3f"></progress></del></pre>

                <ruby id="bdb3f"></ruby>

                ??一站式輕松地調用各大LLM模型接口,支持GPT4、智譜、豆包、星火、月之暗面及文生圖、文生視頻 廣告
                # 優化分頁查詢 一般分頁查詢時,通過創建覆蓋索引能夠比較好地提高性能。一個常見又非常頭疼的問題就是 limit 2000000,10 ,此時需要MySQL排序前2000010 記錄,僅僅返回2000000 - 2000010 的記錄,其他記錄丟棄,查詢排序的代價非常大 。 ![](https://img.kancloud.cn/36/48/36484593c135806ab0b59af8d44077f7_2856x470.png) ## 1 優化思路一 在索引上完成排序分頁操作,最后根據主鍵關聯回原表查詢所需要的其他列內容。 ~~~ select t.* from tb_user t inner join (select id from tb\_user order by id limit 999910,10) a on t.id=a.id; ~~~ ![](https://img.kancloud.cn/47/a4/47a4b653dea8d4082932fbc87df03ed6_2824x484.png) ## 2 優化思路二 該方案適用于主鍵自增的表,可以把Limit 查詢轉換成某個位置的查詢 。 ~~~ select * from tb_user where id > 999910 limit 10; ~~~ ![](https://img.kancloud.cn/21/db/21dbae24554a49f806087bd70c2f1dc9_2844x482.png)
                  <ruby id="bdb3f"></ruby>

                  <p id="bdb3f"><cite id="bdb3f"></cite></p>

                    <p id="bdb3f"><cite id="bdb3f"><th id="bdb3f"></th></cite></p><p id="bdb3f"></p>
                      <p id="bdb3f"><cite id="bdb3f"></cite></p>

                        <pre id="bdb3f"></pre>
                        <pre id="bdb3f"><del id="bdb3f"><thead id="bdb3f"></thead></del></pre>

                        <ruby id="bdb3f"><mark id="bdb3f"></mark></ruby><ruby id="bdb3f"></ruby>
                        <pre id="bdb3f"><pre id="bdb3f"><mark id="bdb3f"></mark></pre></pre><output id="bdb3f"></output><p id="bdb3f"></p><p id="bdb3f"></p>

                        <pre id="bdb3f"><del id="bdb3f"><progress id="bdb3f"></progress></del></pre>

                              <ruby id="bdb3f"></ruby>

                              哎呀哎呀视频在线观看