回答編集履歴
2
調整
answer
CHANGED
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@@ -6,7 +6,7 @@
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6
6
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StartDT datetime,
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7
7
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dist int,
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8
8
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d date as( StartDT - interval 8 hour),
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9
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-
index (dist,
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9
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+
index (dist,d)
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10
10
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);
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11
11
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12
12
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insert into tbl(StartDT,dist) values
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1
調整
answer
CHANGED
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@@ -1,1 +1,31 @@
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1
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-
datetimeから8時間引いた日付で集計すればよいでしょう
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1
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+
datetimeから8時間引いた日付で集計すればよいでしょう
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2
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+
集計用の生成列を予め用意するとより効率的です
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3
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+
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4
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+
```SQL
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5
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+
create table tbl (id int primary key auto_increment,
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6
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+
StartDT datetime,
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7
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+
dist int,
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8
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+
d date as( StartDT - interval 8 hour),
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9
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+
index (dist,StartDT)
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10
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+
);
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11
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+
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12
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+
insert into tbl(StartDT,dist) values
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13
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+
('2023-11-01 08:30',10),
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14
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+
('2023-11-01 09:00',5),
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15
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+
('2023-11-01 10:00',15),
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16
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+
('2023-11-02 08:30',20),
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17
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+
('2023-11-02 11:00',5),
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18
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+
('2023-11-02 14:00',30),
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19
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+
('2023-11-02 16:00',10),
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20
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+
('2023-11-03 02:00',30),
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21
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+
('2023-11-03 04:00',10),
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22
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+
('2023-11-03 14:00',10),
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23
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+
('2023-11-04 06:00',30),
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24
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+
('2023-11-04 08:00',10),
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25
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+
('2023-11-04 10:00',30),
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26
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('2023-11-04 15:00',10);
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27
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+
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28
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+
select d,sum(dist) from tbl
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29
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where d between '2023-11-02' and '2023-11-04'
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30
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+
group by d
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31
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+
```
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