180612_SELECT consecutive rows
2018-06-12 本文已影响0人
郑磊_4135
X city built a new stadium, each day many people visit it and the stats are saved as these columns: id, date, people
Please write a query to display the records which have 3 or more consecutive rows and the amount of people more than 100(inclusive).
For example, the table stadium:
| id | date | people |
|---|---|---|
| 1 | 2017-01-01 | 10 |
| 2 | 2017-01-02 | 109 |
| 3 | 2017-01-03 | 150 |
| 4 | 2017-01-04 | 99 |
| 5 | 2017-01-05 | 145 |
| 6 | 2017-01-06 | 1455 |
| 7 | 2017-01-07 | 199 |
| 8 | 2017-01-08 | 188 |
For the sample data above, the output is:
| id | date | people |
|---|---|---|
| 5 | 2017-01-05 | 145 |
| 6 | 2017-01-06 | 1455 |
| 7 | 2017-01-07 | 199 |
| 8 | 2017-01-08 | 188 |
Note:
Each day only have one row record, and the dates are increasing with id increasing.
SELECT s1.id, s1.data, s1.people
FROM stadium s1, stadium s2, stadium s3
WHERE s1.people >= 100
AND s2.people >= 100
AND s3.people >= 100
AND ((s1.id + 1 = s2.id
AND s1.id + 2 = s3.id)
or
(s1.id - 1 = s2.id
AND s1.id - 2 = s3.id)
or
(s1.id + 1 = s2.id
AND s1.id -1 = s3.id)
)
ORDER BY s1.id ASC
