mysql - SQL查询获取最小、最大行数

Question

我有以下示例数据，我想获取每个连续状态的最小和最大时间。

cat     subcat  status  logtime
fruits  apple   0   30-10-2017 06:00
fruits  apple   0   30-10-2017 06:03
fruits  apple   0   30-10-2017 06:06
fruits  apple   0   30-10-2017 06:09
fruits  apple   0   30-10-2017 06:12
fruits  apple   0   30-10-2017 06:15
fruits  apple   0   30-10-2017 06:18
fruits  apple   0   30-10-2017 06:21
fruits  apple   0   30-10-2017 06:24
fruits  apple   0   30-10-2017 06:27
fruits  apple   0   30-10-2017 06:30
fruits  apple   0   30-10-2017 06:33
fruits  apple   0   30-10-2017 06:36
fruits  apple   0   30-10-2017 06:39
fruits  apple   0   30-10-2017 06:42
fruits  apple   0   30-10-2017 06:45
fruits  apple   0   30-10-2017 06:48
fruits  apple   0   30-10-2017 06:51
fruits  apple   0   30-10-2017 06:54
fruits  apple   0   30-10-2017 06:57
fruits  strawberry  1   30-10-2017 06:00
fruits  strawberry  1   30-10-2017 06:03
fruits  strawberry  1   30-10-2017 06:06
fruits  strawberry  2   30-10-2017 06:09
fruits  strawberry  1   30-10-2017 06:12
fruits  strawberry  1   30-10-2017 06:15
fruits  strawberry  1   30-10-2017 06:18
fruits  strawberry  1   30-10-2017 06:21
fruits  strawberry  1   30-10-2017 06:24
fruits  strawberry  1   30-10-2017 06:27
fruits  strawberry  1   30-10-2017 06:30
fruits  strawberry  1   30-10-2017 06:33
fruits  strawberry  1   30-10-2017 06:36
fruits  strawberry  1   30-10-2017 06:39
fruits  strawberry  2   30-10-2017 06:42
fruits  strawberry  1   30-10-2017 06:45
fruits  strawberry  1   30-10-2017 06:48
fruits  strawberry  1   30-10-2017 06:51
fruits  strawberry  1   30-10-2017 06:54
fruits  strawberry  1   30-10-2017 06:57
fruits  blueberry   0   30-10-2017 06:00
fruits  blueberry   0   30-10-2017 06:03
fruits  blueberry   0   30-10-2017 06:06
fruits  blueberry   2   30-10-2017 06:09
fruits  blueberry   0   30-10-2017 06:12
fruits  blueberry   0   30-10-2017 06:15
fruits  blueberry   0   30-10-2017 06:18
fruits  blueberry   0   30-10-2017 06:21
fruits  blueberry   0   30-10-2017 06:24
fruits  blueberry   0   30-10-2017 06:27
fruits  blueberry   0   30-10-2017 06:30
fruits  blueberry   0   30-10-2017 06:33
fruits  blueberry   0   30-10-2017 06:36
fruits  blueberry   0   30-10-2017 06:39
fruits  blueberry   2   30-10-2017 06:42
fruits  blueberry   0   30-10-2017 06:45
fruits  blueberry   0   30-10-2017 06:48
fruits  blueberry   0   30-10-2017 06:51
fruits  blueberry   0   30-10-2017 06:54
fruits  blueberry   0   30-10-2017 06:57
fruits  guaua   1   30-10-2017 06:00
fruits  guaua   1   30-10-2017 06:03
fruits  guaua   1   30-10-2017 06:06
fruits  guaua   2   30-10-2017 06:09
fruits  guaua   1   30-10-2017 06:12
fruits  guaua   1   30-10-2017 06:15
fruits  guaua   1   30-10-2017 06:18
fruits  guaua   1   30-10-2017 06:21
fruits  guaua   1   30-10-2017 06:24
fruits  guaua   1   30-10-2017 06:27
fruits  guaua   1   30-10-2017 06:30
fruits  guaua   1   30-10-2017 06:33
fruits  guaua   1   30-10-2017 06:36
fruits  guaua   1   30-10-2017 06:39
fruits  guaua   2   30-10-2017 06:42
fruits  guaua   1   30-10-2017 06:45
fruits  guaua   1   30-10-2017 06:48
fruits  guaua   1   30-10-2017 06:51
fruits  guaua   1   30-10-2017 06:54
fruits  guaua   1   30-10-2017 06:57

我正在尝试获取猫和子猫状态的每个状态的最短、最长时间。

输出结果应如下:

cat     subcat      status  mintime maxtime
fruits  apple       0   30-10-2017 06:00    30-10-2017 06:57
fruits  strawberry  1   30-10-2017 06:00    30-10-2017 06:06
fruits  strawberry  2   30-10-2017 06:09    30-10-2017 06:09
fruits  strawberry  1   30-10-2017 06:12    30-10-2017 06:39
fruits  strawberry  2   30-10-2017 06:42    30-10-2017 06:42
fruits  strawberry  1   30-10-2017 06:45    30-10-2017 06:57
fruits  blueberry   0   30-10-2017 06:00    30-10-2017 06:06
fruits  blueberry   2   30-10-2017 06:09    30-10-2017 06:09
fruits  blueberry   0   30-10-2017 06:12    30-10-2017 06:39
fruits  blueberry   2   30-10-2017 06:42    30-10-2017 06:42
fruits  blueberry   0   30-10-2017 06:45    30-10-2017 06:57
fruits  guaua       1   30-10-2017 06:00    30-10-2017 06:06
fruits  guaua       2   30-10-2017 06:09    30-10-2017 06:09
fruits  guaua       1   30-10-2017 06:12    30-10-2017 06:39
fruits  guaua       2   30-10-2017 06:42    30-10-2017 06:42
fruits  guaua       1   30-10-2017 06:45    30-10-2017 06:57

尝试使用以下 SQL 查询，但无法获得上述输出，而是给出最小、最大总小时数。

SELECT cat,
        subcat,
        status,        
        min(logtime) as minlog,
        max(logtime) as maxlog
FROM fruits_log
WHERE 
    cat = 'fruits'
    AND date_format(logtime,'%Y-%m-%d %H) = '2017-10-30 06'
    AND status IN ('0','1','2')
GROUP BY cat,subcat,date_format(logtime,'%Y-%m-%d %H),status
ORDER BY cat,subcat,minlog ;

请帮助我在上面的查询中缺少什么

Answer 1

你可以尝试这样的事情

select  t.cat, t.subcat, t.status, min(t.logdate), max(t.logdate)
from
(
    select t1.cat, t1.subcat, t1.status, t1.logdate, count(t2.cat) grpnum
    from data t1
    left join data t2 on t1.cat = t2.cat and t1.subcat = t2.subcat and 
                         t1.status != t2.status and 
                         t1.logdate < t2.logdate
    group by t1.cat, t1.subcat, t1.status, t1.logdate
) t
group by t.cat, t.subcat, t.status, t.grpnum

我已经在非常小的sample上进行了测试你的数据，但似乎没问题。内部查询使用自连接来隔离具有相同 cat、subcat 和 status 值的连续行。准备就绪后，您只需对数据中的每组行执行group by即可。