# The Great Duck Statistics Quest

DB Quacks SQL Tutorial · level 10 · chapter 2

Dr. Stork, the village statistician, waddles over with a clipboard. "I need to prepare the annual health report! How many ducks do we have? What's the average age? Who's the youngest and oldest? I need these basic statistics for my report!"

## Task

Calculate basic statistics about all ducks from the ducks table: total count, average age, minimum age, and maximum age. You will be using aggregate functions to summarize the data.

## Hint

Look for functions that can count rows, calculate averages, and find minimum and maximum values.

## Expected result

A single row showing count, average, minimum, and maximum age of all ducks.

## 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/10

## Reference

https://duckdb.org/docs/stable/sql/functions/aggregates.html