Question

我有一张包含以下数据的表格：

+----------+---------------------+
| sesiones | fecha               |
+----------+---------------------+
|      350 | 2014-12-26 12:49:02 |
|      329 | 2014-12-26 12:48:01 |
|      320 | 2014-12-26 12:47:02 |
|      320 | 2014-12-26 12:46:01 |
|      328 | 2014-12-26 12:45:02 |
|      314 | 2014-12-26 12:44:01 |
|      318 | 2014-12-26 12:43:02 |
|      308 | 2014-12-26 12:42:01 |
|      326 | 2014-12-26 12:41:02 |
|      308 | 2014-12-26 12:40:01 |

我需要提取＆＃34; sesiones＆＃34;在同一个查询中，使用插入数据的日期时间，使用＆＃34; sesiones＆＃34;前一分钟，但保持日期时间。

输出结果为：

+----------+--------+---------------------+
| sesiones | minute | fecha               |
+----------+--------+---------------------+
|      350 |    329 | 2014-12-26 12:49:02 |
|      329 |    320 | 2014-12-26 12:48:01 |
|      320 |    320 | 2014-12-26 12:47:02 |
|      320 |    328 | 2014-12-26 12:46:01 |
|      328 |    314 | 2014-12-26 12:45:02 |
|      314 |    318 | 2014-12-26 12:44:01 |
|      318 |    308 | 2014-12-26 12:43:02 |
|      308 |    326 | 2014-12-26 12:42:01 |
|      326 |    308 | 2014-12-26 12:41:02 |
|      308 |    NULL| 2014-12-26 12:40:01 |

我尝试了以下查询：

SELECT DATE_FORMAT(l.fecha,'%Y-%m-%d %H:%i'), 
       l.sesiones, 
       ( 
              SELECT sesiones 
              FROM   bearsesiones 
              WHERE  DATE_FORMAT(fecha,'%Y-%m-%d %H:%i') = Date_format(fecha - INTERVAL 1 MINUTE,'%Y-%m-%d %H:%i')) 'minute' 
FROM   bearsesiones l;

结果：

| 2014-12-26 12:41                    |      326 |   NULL |
| 2014-12-26 12:42                    |      308 |   NULL |
| 2014-12-26 12:43                    |      318 |   NULL |
| 2014-12-26 12:44                    |      314 |   NULL |
| 2014-12-26 12:45                    |      328 |   NULL |
| 2014-12-26 12:46                    |      320 |   NULL |
| 2014-12-26 12:47                    |      320 |   NULL |
| 2014-12-26 12:48                    |      329 |   NULL |
| 2014-12-26 12:49                    |      350 |   NULL |

编辑，添加字段Auto_Increment：

|  46 | 2014-12-26 12:41                    |      326 |
|  48 | 2014-12-26 12:42                    |      308 |
|  50 | 2014-12-26 12:43                    |      318 |
|  52 | 2014-12-26 12:44                    |      314 |
|  54 | 2014-12-26 12:45                    |      328 |
|  56 | 2014-12-26 12:46                    |      320 |
|  58 | 2014-12-26 12:47                    |      320 |
|  60 | 2014-12-26 12:48                    |      329 |
|  62 | 2014-12-26 12:49                    |      350 |

有什么想法吗？

Answer 1

SELECT test1.sessiones, test2.sessiones AS
MINUTE , test1.fecha
FROM `test` AS test1
LEFT JOIN test AS test2 ON ( test1.id != test2.id
AND (
    test2.fecha
    BETWEEN DATE_FORMAT( DATE_SUB( test1.fecha, INTERVAL 1 MINUTE ), "%Y-%m-%d %H:%i" )
    AND DATE_FORMAT( test1.fecha, "%Y-%m-%d %H:%i" ) )
)
ORDER BY test1.fecha DESC

Answer 2

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(sesiones INT NOT NULL 
,fecha DATETIME NOT NULL
,PRIMARY KEY(sesiones,fecha)
);

INSERT INTO my_table VALUES
(350,'2014-12-26 12:49:02'),
(329,'2014-12-26 12:48:01'),
(320,'2014-12-26 12:47:02'),
(320,'2014-12-26 12:46:01'),
(328,'2014-12-26 12:45:02'),
(314,'2014-12-26 12:44:01'),
(318,'2014-12-26 12:43:02'),
(308,'2014-12-26 12:42:01'),
(326,'2014-12-26 12:41:02'),
(308,'2014-12-26 12:40:01');

SELECT a.sesiones
     , b.sesiones minute
     , a.fecha 
  FROM
     (
       SELECT x.*,COUNT(*) rank FROM my_table x JOIN my_table y ON y.fecha <= x.fecha GROUP BY x.fecha
     ) a
  LEFT 
  JOIN
     (
       SELECT x.*,COUNT(*) rank FROM my_table x JOIN my_table y ON y.fecha <= x.fecha GROUP BY x.fecha
     ) b 
    ON b.rank = a.rank-1
 ORDER 
    BY a.fecha DESC;

+----------+--------+---------------------+
| sesiones | minute | fecha               |
+----------+--------+---------------------+
|      350 |    329 | 2014-12-26 12:49:02 |
|      329 |    320 | 2014-12-26 12:48:01 |
|      320 |    320 | 2014-12-26 12:47:02 |
|      320 |    328 | 2014-12-26 12:46:01 |
|      328 |    314 | 2014-12-26 12:45:02 |
|      314 |    318 | 2014-12-26 12:44:01 |
|      318 |    308 | 2014-12-26 12:43:02 |
|      308 |    326 | 2014-12-26 12:42:01 |
|      326 |    308 | 2014-12-26 12:41:02 |
|      308 |   NULL | 2014-12-26 12:40:01 |
+----------+--------+---------------------+

MySQL同样查询不同的标准

2 个答案: