# bird-bench / debit_card_specializing__1481

- taskset: [bird-bench](https://harnessreport.com/tasks/bird-bench.md)
- difficulty: hard
- category: database
- language: 
- runnable from the site: no
- agent timeout: 3600s

## Results by harness

_none yet_

## Instruction

```
You are given a natural language question and a SQLite database. Your task is to write a SQL query that answers the question.

Database file: `/app/db.sqlite`
You may use `sqlite3` or Python to inspect the schema and data. Do not modify the database.

Question:
What is the difference in the annual average consumption of the customers with the least amount of consumption paid in CZK for 2013 between SME and LAM, LAM and KAM, and KAM and SME?

Evidence:
annual average consumption of customer with the lowest consumption in each segment = total consumption per year / the number of customer with lowest consumption in each segment; Difference in annual average = SME's annual average - LAM's annual average; Difference in annual average = LAM's annual average - KAM's annual average; Year 2013 can be presented as Between 201301 And 201312; The first 4 strings of the Date values in the yearmonth table can represent year.

Schema:
CREATE TABLE customers
(
    CustomerID INTEGER UNIQUE     not null
        primary key,
    Segment    TEXT null,
    Currency   TEXT null
)
CREATE TABLE gasstations
(
    GasStationID INTEGER    UNIQUE   not null
        primary key,
    ChainID      INTEGER          null,
    Country      TEXT null,
    Segment      TEXT null
)
CREATE TABLE products
(
    ProductID   INTEGER   UNIQUE      not null
        primary key,
    Description TEXT null
)
CREATE TABLE "transactions_1k"
(
    TransactionID INTEGER
        primary key autoincrement,
    Date          DATE,
    Time          TEXT,
    CustomerID    INTEGER,
    CardID        INTEGER,
    GasStationID  INTEGER,
    ProductID     INTEGER,
    Amount        INTEGER,
    Price         REAL
)
CREATE TABLE "yearmonth"
(
    CustomerID  INTEGER not null
        references customers
            on update cascade on delete cascade
        references customers,
    Date        TEXT    not null,
    Consumption REAL,
    primary key (Date, CustomerID)
)

Output:
Write ONLY the SQL query to `/app/answer.sql`. Do not include code fences, comments, or explanations.
```
---
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