Database schema:

CREATE TABLE "Country" (
	"CountryCode" TEXT NOT NULL -- example: ['ABW', 'ADO'],
	"ShortName" TEXT -- example: ['Albania', 'Afghanistan'],
	"TableName" TEXT -- example: ['Albania', 'Afghanistan'],
	"LongName" TEXT -- example: ['Islamic State of Afghanistan', 'Republic of Albania'],
	"Alpha2Code" TEXT -- example: ['AL', 'AF'],
	"CurrencyUnit" TEXT -- example: ['Albanian lek', 'Afghan afghani'],
	"SpecialNotes" TEXT -- example: ['', 'Fiscal year end: March 20; reporting period for na'],
	"Region" TEXT -- example: ['Europe & Central Asia', 'South Asia'],
	"IncomeGroup" TEXT -- example: ['Low income', 'Upper middle income'],
	"Wb2Code" TEXT -- example: ['AL', 'AF'],
	"NationalAccountsBaseYear" TEXT -- example: ['2002/03', 'Original chained constant price data are rescaled.'],
	"NationalAccountsReferenceYear" TEXT -- example: ['', '1996'],
	"SnaPriceValuation" TEXT -- example: ['', 'Value added at basic prices (VAB)'],
	"LendingCategory" TEXT -- example: ['IBRD', 'IDA'],
	"OtherGroups" TEXT -- example: ['', 'HIPC'],
	"SystemOfNationalAccounts" TEXT -- example: ['Country uses the 1993 System of National Accounts ', 'Country uses the 1968 System of National Accounts '],
	"AlternativeConversionFactor" TEXT, 
	"PppSurveyYear" TEXT -- example: ['', 'Rolling'],
	"BalanceOfPaymentsManualInUse" TEXT -- example: ['', 'IMF Balance of Payments Manual, 6th edition.'],
	"ExternalDebtReportingStatus" TEXT -- example: ['Actual', ''],
	"SystemOfTrade" TEXT -- example: ['Special trade system', 'General trade system'],
	"GovernmentAccountingConcept" TEXT -- example: ['Consolidated central government', 'Budgetary central government'],
	"ImfDataDisseminationStandard" TEXT -- example: ['', 'General Data Dissemination System (GDDS)'],
	"LatestPopulationCensus" TEXT -- example: ['1979', '2011'],
	"LatestHouseholdSurvey" TEXT -- example: ['Multiple Indicator Cluster Survey (MICS), 2010/11', 'Demographic and Health Survey (DHS), 2008/09'],
	"SourceOfMostRecentIncomeAndExpenditureData" TEXT -- example: ['Living Standards Measurement Study Survey (LSMS), ', 'Integrated household survey (IHS), 2008'],
	"VitalRegistrationComplete" TEXT -- example: ['', 'Yes'],
	"LatestAgriculturalCensus" TEXT -- example: ['2012', '2013/14'],
	"LatestIndustrialData" INTEGER -- example: ['2010', '2011'],
	"LatestTradeData" INTEGER -- example: ['2013', '2006'],
	"LatestWaterWithdrawalData" INTEGER -- example: ['2000', '2006'],
	PRIMARY KEY ("CountryCode")
)


CREATE TABLE "CountryNotes" (
	"Countrycode" TEXT NOT NULL -- example: ['ABW', 'ADO'],
	"Seriescode" TEXT NOT NULL -- example: ['EG.ELC.RNEW.ZS', 'EG.EGY.PRIM.PP.KD'],
	"Description" TEXT -- example: ['Sources: Estimated based on UN Energy Statistics (', 'Sources: UN Energy Statistics (2014)'],
	PRIMARY KEY ("Countrycode", "Seriescode"), 
	CONSTRAINT fk_countrynotes_series FOREIGN KEY("Seriescode") REFERENCES "Series" ("SeriesCode"),
	CONSTRAINT fk_countrynotes_country FOREIGN KEY("Countrycode") REFERENCES "Country" ("CountryCode")
)


CREATE TABLE "Footnotes" (
	"Countrycode" TEXT NOT NULL -- example: ['ABW', 'ADO'],
	"Seriescode" TEXT NOT NULL -- example: ['BX.KLT.DINV.CD.WD', 'AG.LND.FRST.K2'],
	"Year" TEXT -- example: ['YR1990', 'YR2000'],
	"Description" TEXT -- example: ['Not specified', 'Source: United Nations Conference on Trade and Dev'],
	PRIMARY KEY ("Countrycode", "Seriescode", "Year"), 
	CONSTRAINT fk_footnotes_series FOREIGN KEY("Seriescode") REFERENCES "Series" ("SeriesCode"),
	CONSTRAINT fk_footnotes_country FOREIGN KEY("Countrycode") REFERENCES "Country" ("CountryCode")
)


CREATE TABLE "Indicators" (
	"CountryName" TEXT -- example: ['Caribbean small states', 'Arab World'],
	"CountryCode" TEXT NOT NULL -- example: ['ABW', 'ADO'],
	"IndicatorName" TEXT -- example: ['Adolescent fertility rate (births per 1,000 women ', 'Age dependency ratio (% of working-age population)'],
	"IndicatorCode" TEXT NOT NULL -- example: ['AG.LND.AGRI.ZS', 'AG.LND.AGRI.K2'],
	"Year" INTEGER NOT NULL -- example: ['1961', '1962'],
	"Value" INTEGER -- example: ['87', '133'],
	PRIMARY KEY ("CountryCode", "IndicatorCode", "Year"), 
	CONSTRAINT fk_indicators_country FOREIGN KEY("CountryCode") REFERENCES "Country" ("CountryCode")
)


CREATE TABLE "Series" (
	"SeriesCode" TEXT NOT NULL -- example: ['AG.AGR.TRAC.NO', 'AG.CON.FERT.PT.ZS'],
	"Topic" TEXT -- example: ['Economic Policy & Debt: Balance of payments: Capit', 'Economic Policy & Debt: Balance of payments: Curre'],
	"IndicatorName" TEXT -- example: ['Foreign direct investment, net inflows (% of GDP)', 'Foreign direct investment, net (BoP, current US$)'],
	"ShortDefinition" TEXT -- example: ['', 'Total external debt is debt owed to nonresidents r'],
	"LongDefinition" TEXT -- example: ['Foreign direct investment refers to direct investm', 'Foreign direct investment are the net inflows of i'],
	"UnitOfMeasure" TEXT -- example: ['', '`'],
	"Periodicity" TEXT -- example: ['Annual'],
	"BasePeriod" TEXT -- example: ['', '2005'],
	"OtherNotes" INTEGER, 
	"AggregationMethod" TEXT -- example: ['', 'Weighted average'],
	"LimitationsAndExceptions" TEXT -- example: ['', 'FDI data do not give a complete picture of interna'],
	"NotesFromOriginalSource" TEXT -- example: ['', 'Estimates are presented with uncertainty intervals'],
	"GeneralComments" TEXT -- example: ['Note: Data starting from 2005 are based on the six', 'Note: Data are based on the sixth edition of the I'],
	"Source" TEXT -- example: ['International Monetary Fund, International Financi', 'International Monetary Fund, Balance of Payments S'],
	"StatisticalConceptAndMethodology" TEXT -- example: ['', 'Data on equity flows are based on balance of payme'],
	"DevelopmentRelevance" TEXT -- example: ['', 'Private financial flows - equity and debt - accoun'],
	"RelatedSourceLinks" TEXT -- example: ['', 'World Bank, PovcalNet: an online poverty analysis '],
	"OtherWebLinks" INTEGER, 
	"RelatedIndicators" INTEGER, 
	"LicenseType" TEXT -- example: ['Restricted', 'Open'],
	PRIMARY KEY ("SeriesCode")
)


CREATE TABLE "SeriesNotes" (
	"Seriescode" TEXT NOT NULL -- example: ['DT.DOD.PVLX.CD', 'IC.CUS.DURS.EX'],
	"Year" TEXT NOT NULL -- example: ['YR2002', 'YR2014'],
	"Description" TEXT -- example: ['Interpolated using data for 1957 and 1962.', 'Interpolated using data for 1957 and 1962, if the '],
	PRIMARY KEY ("Seriescode", "Year"), 
	CONSTRAINT fk_seriesnotes_series FOREIGN KEY("Seriescode") REFERENCES "Series" ("SeriesCode")
)

Question: What is the ratio between country with the highest number of infant deaths in 1971 and the lowest number of infant deaths in 1971? List the country with the highest number of infant deaths in 1971 and the lowest number of infant deaths in 1971.
Evidence: ratio = divide(max(value where indicatorname = 'Number of infant deaths' and year = '1971'), min(value where indicatorname = 'Number of infant deaths' and year = '1971')); the highest number of infant deaths in 1971 refers to max(value where indicatorname = 'Number of infant deaths' and year = '1971'); the lowest number of infant deaths in 1971 refers to min(value where indicatorname = 'Number of infant deaths' and year = '1971')

SQL:
SELECT CAST(MAX(value) AS REAL) / MIN(value) FROM indicators WHERE indicatorname = 'Number of infant deaths' AND year = '1971' UNION ALL SELECT countryname FROM ( SELECT countryname, MAX(value) FROM indicators WHERE indicatorname = 'Number of infant deaths' AND year = '1971' ) UNION SELECT countryname FROM ( SELECT countryname, MIN(value) FROM indicators WHERE indicatorname = 'Number of infant deaths' AND year = '1971' )