What is the elevation of the city belonging to Hampden, Massachusetts?
the county of Hampden is located in the state of Massachusetts.
SELECT T3.elevation FROM state AS T1 INNER JOIN country AS T2 ON T1.abbreviation = T2.state INNER JOIN zip_data AS T3 ON T2.zip_code = T3.zip_code WHERE T1.name = 'Massachusetts' AND T2.county = 'HAMPDEN' GROUP BY T3.elevation
CREATE TABLE CBSA
(
    CBSA      INTEGER
            primary key,
    CBSA_name TEXT,
    CBSA_type TEXT
);
CREATE TABLE state
(
    abbreviation TEXT
            primary key,
    name         TEXT
);
CREATE TABLE congress
(
    cognress_rep_id TEXT
            primary key,
    first_name      TEXT,
    last_name       TEXT,
    CID             TEXT,
    party           TEXT,
    state           TEXT,
    abbreviation    TEXT,
    House           TEXT,
    District        INTEGER,
    land_area       REAL,
    foreign key (abbreviation) references state(abbreviation)
);
CREATE TABLE zip_data
(
    zip_code                         INTEGER
            primary key,
    city                             TEXT,
    state                            TEXT,
    multi_county                     TEXT,
    type                             TEXT,
    organization                     TEXT,
    time_zone                        TEXT,
    daylight_savings                 TEXT,
    latitude                         REAL,
    longitude                        REAL,
    elevation                        INTEGER,
    state_fips                       INTEGER,
    county_fips                      INTEGER,
    region                           TEXT,
    division                         TEXT,
    population_2020                  INTEGER,
    population_2010                  INTEGER,
    households                       INTEGER,
    avg_house_value                  INTEGER,
    avg_income_per_household         INTEGER,
    persons_per_household            REAL,
    white_population                 INTEGER,
    black_population                 INTEGER,
    hispanic_population              INTEGER,
    asian_population                 INTEGER,
    american_indian_population       INTEGER,
    hawaiian_population              INTEGER,
    other_population                 INTEGER,
    male_population                  INTEGER,
    female_population                INTEGER,
    median_age                       REAL,
    male_median_age                  REAL,
    female_median_age                REAL,
    residential_mailboxes            INTEGER,
    business_mailboxes               INTEGER,
    total_delivery_receptacles       INTEGER,
    businesses                       INTEGER,
    "1st_quarter_payroll"            INTEGER,
    annual_payroll                   INTEGER,
    employees                        INTEGER,
    water_area                       REAL,
    land_area                        REAL,
    single_family_delivery_units     INTEGER,
    multi_family_delivery_units      INTEGER,
    total_beneficiaries              INTEGER,
    retired_workers                  INTEGER,
    disabled_workers                 INTEGER,
    parents_and_widowed              INTEGER,
    spouses                          INTEGER,
    children                         INTEGER,
    over_65                          INTEGER,
    monthly_benefits_all             INTEGER,
    monthly_benefits_retired_workers INTEGER,
    monthly_benefits_widowed         INTEGER,
    CBSA                             INTEGER,
    foreign key (state) references state(abbreviation),
    foreign key (CBSA) references CBSA(CBSA)
);
CREATE TABLE alias
(
    zip_code INTEGER
            primary key,
    alias    TEXT,
    foreign key (zip_code) references zip_data(zip_code)
);
CREATE TABLE area_code
(
    zip_code  INTEGER,
    area_code INTEGER,
    primary key (zip_code, area_code),
    foreign key (zip_code) references zip_data(zip_code)
);
CREATE TABLE avoid
(
    zip_code  INTEGER,
    bad_alias TEXT,
    primary key (zip_code, bad_alias),
    foreign key (zip_code) references zip_data(zip_code)
);
CREATE TABLE country
(
    zip_code INTEGER,
    county   TEXT,
    state    TEXT,
    primary key (zip_code, county),
    foreign key (zip_code) references zip_data(zip_code),
    foreign key (state) references state(abbreviation)
);
CREATE TABLE zip_congress
(
    zip_code INTEGER,
    district TEXT,
    primary key (zip_code, district),
    foreign key (district) references congress(cognress_rep_id),
    foreign key (zip_code) references zip_data(zip_code)
);
