# CASE Closed: The Duck Detective Story

DB Quacks SQL Tutorial · level 19 · chapter 4

Detective duck approaches with a magnifying glass. "Elementary! I need to categorize ducks as 'Young' (2 or under), 'Adult' (3-4), or 'Senior' (5+) for demographic analysis. Help solve this classification mystery!"

## Task

Show each duck's name with their age category (Young/Adult/Senior) based on their age from the 'data/ducks.csv' table. You will be creating conditional logic to categorize ducks into age groups.

## Hint

Look for a conditional statement that can evaluate multiple conditions and return different values based on the results.

## Expected result

A table showing duck names and their age categories.

## Tables

### `duck_diaries` (10 rows)

| column | type |
| --- | --- |
| diary_id | BIGINT |
| duck_id | BIGINT |
| entry_date | DATE |
| diary_text | VARCHAR |
| mood | VARCHAR |

### `duck_surveys` (5000 rows)

| column | type |
| --- | --- |
| survey_id | BIGINT |
| duck_id | BIGINT |
| age | BIGINT |
| favorite_food | VARCHAR |
| favorite_pond | BIGINT |
| swimming_rating | BIGINT |
| migration_preference | VARCHAR |
| social_behavior | VARCHAR |
| health_status | VARCHAR |
| activity_level | VARCHAR |
| survey_date | DATE |
| survey_location | BIGINT |

### `ducks` (15 rows)

| column | type |
| --- | --- |
| id | BIGINT |
| name | VARCHAR |
| age | BIGINT |
| species | VARCHAR |
| birth_date | DATE |
| arrival_date | DATE |

### `ponds` (3 rows)

| column | type |
| --- | --- |
| pond_id | BIGINT |
| pond_name | VARCHAR |
| location_lat | DOUBLE |
| location_lng | DOUBLE |
| capacity | BIGINT |
| features | VARCHAR[] |
| amenities | VARCHAR[] |

## Data

The tables live in a DuckDB database: https://dbquacks.com/data/databases/tutorial.duckdb

To query it outside the browser, attach it read-only:

```sql
ATTACH 'https://dbquacks.com/data/databases/tutorial.duckdb' AS db (READ_ONLY);
USE db;
```

Play it in the browser: https://dbquacks.com/tutorial/19

## Reference

https://duckdb.org/docs/sql/expressions/case