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本篇內(nèi)容主要講解“mysql怎么實現(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,實用性強。下面就讓小編來帶大家學(xué)習(xí)“mysql怎么實現(xiàn)的lead和lag函數(shù)功能”吧!
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“mysql怎么實現(xiàn)的lead和lag函數(shù)功能”有了更深的了解,不妨來實際操作一番吧!這里是億速云網(wǎng)站,更多相關(guān)內(nèi)容可以進入相關(guān)頻道進行查詢,關(guān)注我們,繼續(xù)學(xué)習(xí)!
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