/* Given the following database schema: */
CREATE TABLE "Country"
(
    CountryCode                                TEXT not null
        primary key,
    ShortName                                  TEXT,
    TableName                                  TEXT,
    LongName                                   TEXT,
    Alpha2Code                                 TEXT,
    CurrencyUnit                               TEXT,
    SpecialNotes                               TEXT,
    Region                                     TEXT,
    IncomeGroup                                TEXT,
    Wb2Code                                    TEXT,
    NationalAccountsBaseYear                   TEXT,
    NationalAccountsReferenceYear              TEXT,
    SnaPriceValuation                          TEXT,
    LendingCategory                            TEXT,
    OtherGroups                                TEXT,
    SystemOfNationalAccounts                   TEXT,
    AlternativeConversionFactor                TEXT,
    PppSurveyYear                              TEXT,
    BalanceOfPaymentsManualInUse               TEXT,
    ExternalDebtReportingStatus                TEXT,
    SystemOfTrade                              TEXT,
    GovernmentAccountingConcept                TEXT,
    ImfDataDisseminationStandard               TEXT,
    LatestPopulationCensus                     TEXT,
    LatestHouseholdSurvey                      TEXT,
    SourceOfMostRecentIncomeAndExpenditureData TEXT,
    VitalRegistrationComplete                  TEXT,
    LatestAgriculturalCensus                   TEXT,
    LatestIndustrialData                       INTEGER,
    LatestTradeData                            INTEGER,
    LatestWaterWithdrawalData                  INTEGER
)

CREATE TABLE "Series"
(
    SeriesCode                       TEXT not null
        primary key,
    Topic                            TEXT,
    IndicatorName                    TEXT,
    ShortDefinition                  TEXT,
    LongDefinition                   TEXT,
    UnitOfMeasure                    TEXT,
    Periodicity                      TEXT,
    BasePeriod                       TEXT,
    OtherNotes                       INTEGER,
    AggregationMethod                TEXT,
    LimitationsAndExceptions         TEXT,
    NotesFromOriginalSource          TEXT,
    GeneralComments                  TEXT,
    Source                           TEXT,
    StatisticalConceptAndMethodology TEXT,
    DevelopmentRelevance             TEXT,
    RelatedSourceLinks               TEXT,
    OtherWebLinks                    INTEGER,
    RelatedIndicators                INTEGER,
    LicenseType                      TEXT
)

CREATE TABLE CountryNotes
(
    Countrycode TEXT NOT NULL ,
    Seriescode  TEXT NOT NULL ,
    Description TEXT,
    primary key (Countrycode, Seriescode),
    FOREIGN KEY (Seriescode) REFERENCES Series(SeriesCode),
    FOREIGN KEY (Countrycode) REFERENCES Country(CountryCode)
)

CREATE TABLE Footnotes
(
    Countrycode TEXT NOT NULL ,
    Seriescode  TEXT NOT NULL ,
    Year        TEXT,
    Description TEXT,
    primary key (Countrycode, Seriescode, Year),
    FOREIGN KEY (Seriescode) REFERENCES Series(SeriesCode),
    FOREIGN KEY (Countrycode) REFERENCES Country(CountryCode)
)

CREATE TABLE Indicators
(
    CountryName   TEXT,
    CountryCode   TEXT NOT NULL ,
    IndicatorName TEXT,
    IndicatorCode TEXT NOT NULL ,
    Year          INTEGER NOT NULL ,
    Value         INTEGER,
    primary key (CountryCode, IndicatorCode, Year),
    FOREIGN KEY (CountryCode) REFERENCES Country(CountryCode)
)

CREATE TABLE SeriesNotes
(
    Seriescode  TEXT not null ,
    Year        TEXT not null ,
    Description TEXT,
    primary key (Seriescode, Year),
    foreign key (Seriescode) references Series(SeriesCode)
)

/* Answer the following: Which country has the smallest land area in square kilometers for 19 consecutive years starting from year 1961? Indicate how much is its land area in square kilometers in those years and the income group of the country. the smallest land area in square kilometers refers to min(value where IndicatorName like 'Land area (sq. km)'); for 19 consecutive years starting from year 1961 refers to Year between 1961 and 1979 */
SELECT 
SELECT T1.CountryName, SUM(T1.Value) area, T2.IncomeGroup FROM Indicators AS T1 INNER JOIN Country AS T2 ON T1.CountryCode = T2.CountryCode WHERE T1.IndicatorName = 'Land area (sq. km)' AND T1.Year >= 1961 AND T1.Year < 1980 GROUP BY T1.CountryCode ORDER BY SUM(T1.Value) ASC LIMIT 1