Question

使用与小型精品店相关的虚拟数据我试图使用3个月内收集的数据计算出一天中哪个小时最繁忙。我使用SQL来构建我的查询，我不知道从哪里开始，我已经找到了最忙碌的一天，但我正在努力利用时间。以下是我的数据示例，我还在努力构建查询：

SALE_ID PRODUCT_NAME    PRICE_RANGE PRODUCT_COST    DATEOF  DAY_OF_WEEK TIME
1   DRESS   HIGH    69  2/18/2017   3   13:43
2   TRAINERS    MEDIUM  48  1/1/2017    3   9:21
5   TROUSERS    HIGH    70  3/2/2017    4   9:20
6   TROUSERS    MEDIUM  30  3/30/2017   4   17:00
7   SHORTS  LOW 23  3/27/2017   4   16:25
8   TROUSERS    MEDIUM  53  3/28/2017   4   9:00
10  TROUSERS    MEDIUM  32  3/3/2017    4   9:40
11  SHIRT   HIGH    88  3/12/2017   4   9:50
9   TRAINERS    MEDIUM  36  3/31/2017   4   9:30
12  TRAINERS    HIGH    100 1/20/2017   4   9:10
13  DRESS   MEDIUM  48  2/26/2017   4   9:40
14  SHOES   MEDIUM  35  1/31/2017   4   10:41
16  TROUSERS    MEDIUM  30  2/27/2017   4   10:19
17  TROUSERS    LOW 21  3/10/2017   4   9:15
18  DRESS   HIGH    92  1/23/2017   4   10:24
19  SHIRT   HIGH    84  3/6/2017    4   9:05
20  TRAINERS    LOW 27  1/21/2017   4   10:26
21  TROUSERS    HIGH    88  2/27/2017   4   10:55
23  HAT MEDIUM  34  1/25/2017   4   12:19
25  SHOES   LOW 22  1/6/2017    4   12:30
26  BELT    HIGH    86  2/25/2017   4   12:45
27  DRESS   HIGH    84  3/26/2017   4   9:50
28  JACKET  HIGH    99  2/20/2017   4   12:45
29  SHIRT   MEDIUM  48  2/21/2017   4   13:00
31  TRAINERS    HIGH    92  2/3/2017    4   12:25
32  BELT    MEDIUM  84  3/27/2017   4   10:10
33  TRAINERS    LOW 27  2/12/2017   3   13:29
34  SHORTS  HIGH    88  1/18/2017   4   16:06
35  HAT HIGH    87  2/9/2017    4   14:26

Answer 1

如果DATEOF是DATE列并且有时间组件，则可以按小时组件进行分组。

select hour_of_day , tph
FROM
(
select TO_CHAR(dateof,'HH24') hour_of_day,count(*) tph
FROM
salestable
GROUP  BY TO_CHAR(dateof,'HH24')
ORDER BY tph desc
) where ROWNUM = 1 ;

如果您没有时间组件且需要使用time列，则可以使用SUBSTR和INSTR从time中提取小时。< / p>

select hour_of_day , tph
FROM
(
select SUBSTR(time,1,INSTR(time,':')-1) hour_of_day,count(*) tph
FROM salestable GROUP  BY SUBSTR(time,1,INSTR(time,':')-1)
ORDER BY tph desc
) where ROWNUM = 1 ;

DEMO

尝试工作当天的哪个小时对于使用SQL的小型企业来说是最繁忙的

1 个答案: