选择带有重复项的最新时间戳MySQL的行

时间：2015-08-03 06:42:52

标签： mysql sql timestamp

我正在尝试选择具有最新时间戳的行。这是表格的一个示例：

+--------+-------------+------------------+------------+--------+---------+-----------+---------------+----------------+---------------------+-----------------------------------------+
| id     | tester_name | frame            | board_name | config | part_no | serial_no | license_count | legal_enabling | last_checked        | log_name                                |
+--------+-------------+------------------+------------+--------+---------+-----------+---------------+----------------+---------------------+-----------------------------------------+ 
| 162936 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 6      | 974-331-44 | 302501d   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162937 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 7      | 974-331-44 | c0165ec   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162938 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 8      | 974-331-44 | c13100e   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162939 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 9      | 974-331-44 | 302c919   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162941 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 14     | 974-331-44 | c00b41b   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162942 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 15     | 974-331-44 | c13101e   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162943 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 16     | 974-331-44 | 3014a1b   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 162944 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 17     | 974-331-44 | 302cc7e   |               |                | 2015-08-01 19:48:48 | IGXLEventLog.8.1.2015.19.48.15.054.log  |
| 166555 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 6      | 974-331-44 | 302501d   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166556 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 7      | 974-331-44 | c0165ec   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166557 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 8      | 974-331-44 | c13100e   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166558 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 9      | 974-331-44 | 302c919   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166560 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 14     | 974-331-44 | c00b41b   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166561 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 15     | 974-331-44 | c13101e   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166562 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 16     | 974-331-44 | 3014a1b   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166563 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 17     | 974-331-44 | 302cc7e   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log | 
+--------+-------------+------------------+------------+--------+---------+-----------+---------------+----------------+---------------------+-----------------------------------------+

我用来获取上述内容的查询是

SELECT ti.* 
FROM New_OTPMS.TBL_TESTER_ONLINE_INFO ti 
INNER JOIN TBL_TESTER_LIST tl 
ON ti.tester_name = tl.tester_name 
WHERE ti.board_name = 'HSD-M' 
AND tl.tester_type = 'UFLEX' 
AND ti.tester_name = 'UFLEX-10' 
ORDER BY ti.tester_name;

正如你所看到的，它只是从表中得到了所有东西。我想获取仅基于最新时间戳的行。注意：不是一行带有最新时间戳，而是基于config的非重复行，带有SAME最新时间戳。

我想要的最新/行是

+--------+-------------+------------------+------------+--------+---------+-----------+---------------+----------------+---------------------+-----------------------------------------+
| id     | tester_name | frame            | board_name | config | part_no | serial_no | license_count | legal_enabling | last_checked        | log_name                                |
+--------+-------------+------------------+------------+--------+---------+-----------+---------------+----------------+---------------------+-----------------------------------------+
| 166555 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 6      | 974-331-44 | 302501d   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166556 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 7      | 974-331-44 | c0165ec   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166557 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 8      | 974-331-44 | c13100e   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166558 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 9      | 974-331-44 | 302c919   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166560 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 14     | 974-331-44 | c00b41b   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166561 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 15     | 974-331-44 | c13101e   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166562 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 16     | 974-331-44 | 3014a1b   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
| 166563 | UFLEX-10    | TEST_HEAD TH 1 | HSD-M      | 17     | 974-331-44 | 302cc7e   |               |                | 2015-07-29 02:32:39 | IGXLEventLog.7.29.2015.02.32.05.475.log |
+--------+-------------+------------------+------------+--------+---------+-----------+---------------+----------------+---------------------+-----------------------------------------+

对此有何帮助？

编辑：我编辑了上面的数据，以便与问题相对应。

2 个答案:

答案 0 :(得分：0)

SELECT ti.*
FROM New_OTPMS.TBL_TESTER_ONLINE_INFO ti
INNER JOIN TBL_TESTER_LIST tl
ON ti.tester_name = tl.tester_name
WHERE ti.board_name = 'DC30'
AND tl.tester_type = 'UFLEX'
AND ti.tester_name = 'UFLEX-10'
ORDER BY ti.last_checked DESC LIMIT 1;

上面的sql应该可行。你的原始sql是按名称排序而不是时间。如果你只想要那一行最后一行，你可以在最后添加LIMIT 1。

答案 1 :(得分：0)

试试这个

SELECT ti.*
FROM New_OTPMS.TBL_TESTER_ONLINE_INFO ti
INNER JOIN TBL_TESTER_LIST tl
ON ti.tester_name = tl.tester_name
WHERE ti.board_name = 'DC30'
AND tl.tester_type = 'UFLEX'
AND ti.tester_name = 'UFLEX-10'
AND ti.last_checked = (
    SELECT MAX(last_checked) 
    FROM New_OTPMS.TBL_TESTER_ONLINE_INFO
    WHERE
        board_name = 'DC30'
        AND tester_name = 'UFLEX-10'    
)
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