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Covid19Dataexploration.sql
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/*
Covid 19 Data Exploration
Skills used: Joins, CTE's, Temp Tables, Windows Functions, Aggregate Functions, Creating Views, Converting Data Types
*/
Select *
From [portfolio project] ..coviddeath2
Where continent is not null
order by 3,4
Select Location, date, total_cases, new_cases, total_deaths, population
From [portfolio project] ..coviddeath2
Where continent is not null
order by 1,2
-- Total Cases vs Total Deaths
-- Shows possibility of dying if you contract covid in your country
Select Location, date, total_cases,total_deaths, (total_deaths/total_cases)*100 as DeathPercentage
From [portfolio project] ..coviddeath2
Where Location like 'India'
and continent is not null
order by 1,2
-- Total Cases vs Population
-- Shows what percentage of population infected with Covid
Select Location, date, Population, total_cases, (total_cases/population)*100 as PercentPopulationInfected
From [portfolio project] ..coviddeath2
Where location like 'India'
order by 1,2
-- Countries with Highest Infection Rate compared to Population
Select Location, Population, MAX(total_cases) as HighestInfectionCount, Max((total_cases/population))*100 as PercentPopulationInfected
From [portfolio project] ..coviddeath2
Group by Location, Population
order by PercentPopulationInfected desc
-- Countries with Highest Death Count per Population
Select Location, MAX(cast(Total_deaths as int)) as TotalDeathCount
From [portfolio project] ..coviddeath2
Where continent is not null
Group by Location
order by TotalDeathCount desc
-- Shows contintents with the highest death count per population
Select continent, MAX(cast(Total_deaths as int)) as TotalDeathCount
From [portfolio project] ..coviddeath2
Where continent is not null
Group by continent
order by TotalDeathCount desc
-- GLOBAL NUMBERS
Select date, SUM(new_cases) as total_cases, SUM(cast(new_deaths as int)) as total_deaths, SUM(cast(new_deaths as int))/SUM(New_Cases)*100 as DeathPercentage
From [portfolio project] ..coviddeath2
where continent is not null
Group By date
order by 1,2
Select SUM(new_cases) as total_cases, SUM(cast(new_deaths as int)) as total_deaths, SUM(cast(new_deaths as int))/SUM(New_Cases)*100 as DeathPercentage
From [portfolio project] ..coviddeath2
where continent is not null
--Group By date
order by 1,2
-- Total Population vs Vaccinations
Select Death.continent, Death.location, Death.date, Death.population, Vaccine.new_vaccinations
From [portfolio project] ..coviddeath2 Death
Join [portfolio project] ..covidvaccination2 Vaccine
On Death.location = Vaccine.location
and Death.date = Vaccine.date
where Death.continent is not null
order by 2,3
-- Shows Percentage of Population that has recieved at least one Covid Vaccine
Select Death.continent, Death.location, Death.date, Death.population, Vaccine.new_vaccinations
,SUM(cast(Vaccine.new_vaccinations as bigint)) OVER (Partition by Death.Location Order by Death.location, Death.Date) as RollingPeopleVaccinated
From [portfolio project] ..coviddeath2 Death
Join [portfolio project] ..covidvaccination2 Vaccine
On Death.location = Vaccine.location
and Death.date = Vaccine.date
where Death.continent is not null
order by 2,3
-- Using CTE to perform Calculation on Partition By in previous query
With PopvsVac (Continent, Location, Date, Population, new_Vaccinations, RollingPeopleVaccinated)
as
(
Select Death.continent, Death.location, Death.date, Death.population, Vaccine.new_vaccinations
, SUM(Cast(Vaccine.new_vaccinations as bigint)) OVER (Partition by Death.Location Order by Death.location, Death.Date) as RollingPeopleVaccinated
From [portfolio project] ..coviddeath2 Death
Join [portfolio project] ..covidvaccination2 Vaccine
On Death.location = Vaccine.location
and Death.date = Vaccine.date
where Death.continent is not null
)
Select *, (RollingPeopleVaccinated/Population)*100 as PercentagePeopleVaccinated
From PopvsVac
-- Using Temp Table to perform Calculation on Partition By in previous query
DROP Table if exists #PercentPopulationVaccinated
Create Table #PercentPopulationVaccinated
(
Continent nvarchar(255),
Location nvarchar(255),
Date datetime,
Population numeric,
new_vaccinations numeric,
RollingPeopleVaccinated numeric
)
Insert into #PercentPopulationVaccinated
Select Death.continent, Death.location, Death.date, Death.population, Vaccine.new_vaccinations
, SUM(Cast(Vaccine.new_vaccinations as bigint)) OVER (Partition by Death.Location Order by Death.location, Death.Date) as RollingPeopleVaccinated
From [portfolio project] ..coviddeath2 Death
Join [portfolio project] ..covidvaccination2 Vaccine
On Death.location = Vaccine.location
and Death.date = Vaccine.date
Select *, (RollingPeopleVaccinated/Population)*100
From #PercentPopulationVaccinated
order by 2,3
-- Creating View to store data for later visualizations
Create View PercentPopulationVaccinated as
Select Death.continent, Death.location, Death.date, Death.population, Vaccine.new_vaccinations
, SUM(Cast(Vaccine.new_vaccinations as bigint)) OVER (Partition by Death.Location Order by Death.location, Death.Date) as RollingPeopleVaccinated
From [portfolio project] ..coviddeath2 Death
Join [portfolio project] ..covidvaccination2 Vaccine
On Death.location = Vaccine.location
and Death.date = Vaccine.date
where Death.continent is not null