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IshaSQL

Interview Core Track · Hard · 35 min

Human Traffic of Stadium

Table: Stadium +---------------+---------+ | Column Name | Type | +---------------+---------+ | id | int | | visit_date | date | | people | int | +----------...

Interview Core Track
Hard
35 min
filtering

Company labels are directional practice context, not official interview guidance.

Timer 00:00
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Objective

Practice filtering through a IshaSQL-tagged business scenario.

Approach

Use this track to improve speed, edge-case handling, and accuracy under timed conditions.

Company context

Company labels are directional practice context, not official interview guidance.

Prereq: query basics

Table: Stadium +---------------+---------+ | Column Name | Type | +---------------+---------+ | id | int | | visit_date | date | | people | int | +---------------+---------+ visit_date is the column with unique values for this table. Each row of this table contains the visit date and visit id to the stadium with the number of people during the visit. As the id increases, the date increases as well. Write a solution to display the records with three or more rows with consecutive id 's, and the number of people is greater than or equal to 100 for each. Return the result table ordered by visit_date in ascending order . The result format is in the following example. Example 1: Input: Stadium table: +------+------------+-----------+ | id | visit_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 | 2017-01-09 | 188 | +------+------------+-----------+ Output: +------+------------+-----------+ | id | visit_date | people | +------+------------+-----------+ | 5 | 2017-01-05 | 145 | | 6 | 2017-01-06 | 1455 | | 7 | 2017-01-07 | 199 | | 8 | 2017-01-09 | 188 | +------+------------+-----------+ Explanation: The four rows with ids 5, 6, 7, and 8 have consecutive ids and each of them has >= 100 people attended. Note that row 8 was included even though the visit_date was not the next day after row 7. The rows with ids 2 and 3 are not included because we need at least three consecutive ids.

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