https://github.com/yawkar/sql-mystery-solution
(Student Lab Project) (not quite the right) Solution to https://mystery.knightlab.com/
https://github.com/yawkar/sql-mystery-solution
sql
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(Student Lab Project) (not quite the right) Solution to https://mystery.knightlab.com/
- Host: GitHub
- URL: https://github.com/yawkar/sql-mystery-solution
- Owner: YawKar
- Created: 2022-10-24T09:14:56.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2022-10-24T11:12:38.000Z (over 3 years ago)
- Last Synced: 2025-02-15T04:26:32.038Z (about 1 year ago)
- Topics: sql
- Homepage:
- Size: 4.88 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# 1 Этап
## Получаем нужный отчёт об убийстве
Запрос:
```sql
SELECT *
FROM crime_scene_report
WHERE date = '20180115'
AND city = 'SQL City'
AND type = 'murder'
```
Вывод:
| date | type | description | city |
|----------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------|
| 20180115 | murder | Security footage shows that there were 2 witnesses. The first witness lives at the last house on "Northwestern Dr". The second witness, named Annabel, lives somewhere on "Franklin Ave". | SQL City |
## Найдём обоих свидетелей в таблице `person`
Запрос:
```sql
SELECT *
FROM person
WHERE name LIKE 'Annabel %'
OR (address_street_name = 'Northwestern Dr'
AND address_number = (SELECT MAX(address_number)
FROM person
WHERE address_street_name = 'Northwestern Dr'))
```
Вывод:
| id | name | license_id | address_number | address_street_name | ssn |
|-------|----------------|------------|----------------|---------------------|-----------|
| 14887 | Morty Schapiro | 118009 | 4919 | Northwestern Dr | 111564949 |
| 16371 | Annabel Miller | 490173 | 103 | Franklin Ave | 318771143 |
## Достанем интервью с обоими свидетелями
Запрос:
```sql
SELECT name, transcript
FROM person p
LEFT JOIN interview i ON i.person_id = p.id
WHERE p.id = 14887
OR p.id = 16371
```
Вывод:
| name | transcript |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Morty Schapiro | I heard a gunshot and then saw a man run out. He had a "Get Fit Now Gym" bag. The membership number on the bag started with "48Z". Only gold members have those bags. The man got into a car with a plate that included "H42W". |
| Annabel Miller | I saw the murder happen, and I recognized the killer from my gym when I was working out last week on January the 9th. |
## Найдём всех gold member'ов с номером, подходящим под `48Z%`
Запрос:
```sql
SELECT *
FROM get_fit_now_member
WHERE id LIKE '48Z%'
AND membership_status = 'gold'
```
Вывод:
| id | person_id | name | membership_start_date | membership_status |
|-------|-----------|---------------|-----------------------|-------------------|
| 48Z7A | 28819 | Joe Germuska | 20160305 | gold |
| 48Z55 | 67318 | Jeremy Bowers | 20160101 | gold |
## Найдём, кому принадлежит машина с номером, включающим в себя `H42W`
Запрос:
```sql
SELECT p.id, name, plate_number
FROM drivers_license dl
JOIN person p ON p.license_id = dl.id
WHERE plate_number LIKE '%H42W%'
```
Вывод:
| id | name | plate_number |
|-------|----------------|--------------|
| 51739 | Tushar Chandra | 4H42WR |
| 67318 | Jeremy Bowers | 0H42W2 |
| 78193 | Maxine Whitely | H42W0X |
## Результат 1-го этапа
Запрос:
```sql
INSERT INTO solution
VALUES (1, 'Jeremy Bowers');
SELECT value
FROM solution;
```
Вывод:
| value |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Congrats, you found the murderer! But wait, there's more... If you think you're up for a challenge, try querying the interview transcript of the murderer to find the real villain behind this crime. If you feel especially confident in your SQL skills, try to complete this final step with no more than 2 queries. Use this same INSERT statement with your new suspect to check your answer. |
# 2 Этап
## Достанем интервью с Jeremy Bowers
Запрос:
```sql
SELECT *
FROM interview
WHERE person_id = 67318
```
Вывод:
| person_id | transcript |
|-----------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 67318 | I was hired by a woman with a lot of money. I don't know her name but I know she's around 5'5" (65") or 5'7" (67"). She has red hair and she drives a Tesla Model S. I know that she attended the SQL Symphony Concert 3 times in December 2017. |
## Найдём нанимательницу
Запрос:
```sql
SELECT DISTINCT name
FROM drivers_license dl
JOIN person p ON p.license_id = dl.id
JOIN income USING(ssn)
JOIN facebook_event_checkin f ON f.person_id = p.id
WHERE height BETWEEN 65 AND 67
AND hair_color = 'red'
AND car_model = 'Model S'
AND car_make = 'Tesla'
```
Вывод:
| name |
|------------------|
| Miranda Priestly |
## Результат 2-го этапа
Запрос:
```sql
INSERT INTO solution
VALUES (1, 'Miranda Priestly');
SELECT value
FROM solution;
```
Вывод:
| value |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Congrats, you found the brains behind the murder! Everyone in SQL City hails you as the greatest SQL detective of all time. Time to break out the champagne! |