本篇內(nèi)容主要講解“MySQL怎么實(shí)現(xiàn)的lead和lag函數(shù)功能”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“mysql怎么實(shí)現(xiàn)的lead和lag函數(shù)功能”吧!

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MariaDB [test]> select * from t;
+--------------------------------------+---------------------+
| case_id                              | assigned_date       |
+--------------------------------------+---------------------+
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-18 14:08:14 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d51 | 2016-05-18 14:25:22 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-18 14:26:01 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-19 07:19:13 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-19 07:53:09 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d51 | 2016-05-19 08:18:01 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-19 12:12:35 |
+--------------------------------------+---------------------+
7 rows in set (0.00 sec)
MariaDB [test]> SELECT t1.case_id, t1.assigned_date,
    ->        (SELECT t2.assigned_date
    ->        FROM t AS t2
    ->        WHERE t2.case_id = t1.case_id AND
    ->              t2.assigned_date > t1.assigned_date
    ->        ORDER BY t2.assigned_date LIMIT 1) AS next_date,
    ->        (SELECT t2.assigned_date
    ->        FROM t AS t2
    ->        WHERE t2.case_id = t1.case_id AND
    ->              t2.assigned_date < t1.assigned_date
    ->        ORDER BY t2.assigned_date DESC LIMIT 1) AS prev_date
    -> FROM t AS t1;
+--------------------------------------+---------------------+---------------------+---------------------+
| case_id                              | assigned_date       | next_date           | prev_date           |
+--------------------------------------+---------------------+---------------------+---------------------+
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-18 14:08:14 | 2016-05-18 14:26:01 | NULL                |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d51 | 2016-05-18 14:25:22 | 2016-05-19 08:18:01 | NULL                |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-18 14:26:01 | 2016-05-19 07:19:13 | 2016-05-18 14:08:14 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-19 07:19:13 | 2016-05-19 07:53:09 | 2016-05-18 14:26:01 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-19 07:53:09 | 2016-05-19 12:12:35 | 2016-05-19 07:19:13 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d51 | 2016-05-19 08:18:01 | NULL                | 2016-05-18 14:25:22 |
| 41c19f76-e52e-c4c9-62c2-573c71ec5d50 | 2016-05-19 12:12:35 | NULL                | 2016-05-19 07:53:09 |
+--------------------------------------+---------------------+---------------------+---------------------+
7 rows in set (0.01 sec)

到此，相信大家對(duì)“mysql怎么實(shí)現(xiàn)的lead和lag函數(shù)功能”有了更深的了解，不妨來實(shí)際操作一番吧！這里是創(chuàng)新互聯(lián)網(wǎng)站，更多相關(guān)內(nèi)容可以進(jìn)入相關(guān)頻道進(jìn)行查詢，關(guān)注我們，繼續(xù)學(xué)習(xí)！