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Portfolio-SQL_Covid_data.sql
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Portfolio-SQL_Covid_data.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 PortfolioProject..CovidDeaths
Where continent is not null
Order by 3,4
-- Select Data that we are going to be using
Select location, date, total_cases, new_cases, total_deaths, population
From PortfolioProject..CovidDeaths
Where continent is not null
order by 1,2
-- Total Cases vs Total Deaths
-- Shows the likelihood of dying if you contract covid in the States
Select location, date, total_cases, total_deaths, (cast(total_deaths as float)/cast(total_cases as float))*100 as DeathPercentage
From PortfolioProject..CovidDeaths
Where location like '%states%'
and continent is not null
order by 1,2
-- Total Cases vs Population
-- Shows what percentage of Population infected with Covid
Select location, date, total_cases, Population, (cast(total_cases as float)/cast(Population as float))*100 as PercentPopulationInfected
From PortfolioProject..CovidDeaths
--Where location like '%states%'
Where continent is not null
order by 1,2
-- Countries with highest Infection Rate compared to Population
Select location, Population, MAX(cast(total_cases as int)) as HighestInfectionCount, (Max(total_cases)/Population)*100 as PercentPopulationInfected
From PortfolioProject..CovidDeaths
--Where location like '%states%'
Where continent is not null
Group by location, population
Order by PercentPopulationInfected desc
-- Countries with highest Death Count per Population
Select location, Population, MAX(cast(total_deaths as float)) as TotalDeathCount, (Max(cast(total_deaths as float))/Population)*100 as PercentagePopulationDeath
From PortfolioProject..CovidDeaths
--Where location like '%states%'
Where continent is not null
Group by location, population
Order by PercentagePopulationDeath desc
-- BREAKING THINGS DOWN BY CONTINENT
-- Showing contintents with the highest death count per population
Select continent, MAX(cast(total_deaths as float)) as TotalDeathCount
From PortfolioProject..CovidDeaths
--Where location like '%states%'
Where continent is not null
Group by continent
Order by TotalDeathCount desc
-- Global Death percentage
Select SUM(new_cases) as total_cases, SUM(cast(new_deaths as float)) as TotalDeathCount, SUM(cast(new_deaths as float))/SUM(new_cases)*100 as DeathPercentage
From PortfolioProject..CovidDeaths
--Where location like '%states%'
Where continent is not null
--Group by date
Order by 1,2
-- Total Population vs Vaccinations
-- Shows Percentage of Population that has recieved at least one Covid Vaccine
Select dea.continent, dea.location, dea.date, population, vac.new_vaccinations
, SUM(Convert(float, vac.new_vaccinations)) Over (Partition by dea.location Order by dea.location, dea.date)
as TotalVaccination
From PortfolioProject..CovidDeaths dea
Join PortfolioProject..CovidVaccinations vac
On dea.location = vac.location
and dea.date = vac.date
Where dea.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, TotalVaccination)
as
(
Select dea.continent, dea.location, dea.date, population, new_vaccinations
, SUM(Convert(float, vac.new_vaccinations)) Over (Partition by dea.location Order by dea.location, dea.date)
as TotalVaccination
From PortfolioProject..CovidDeaths dea
Join PortfolioProject..CovidVaccinations vac
On dea.location = vac.location
and dea.date = vac.date
Where dea.continent is not null
--order by 2,3
)
Select *, (TotalVaccination/population)*100 as VaccinatedPercentage
From PopVsVac
order by 2,3
-- 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,
TotalVaccination numeric
)
Insert into #PercentPopulationVaccinated
Select dea.continent, dea.location, dea.date, population, new_vaccinations
, SUM(Convert(float, vac.new_vaccinations)) Over (Partition by dea.location Order by dea.location, dea.date)
as TotalVaccination
From PortfolioProject..CovidDeaths dea
Join PortfolioProject..CovidVaccinations vac
On dea.location = vac.location
and dea.date = vac.date
--Where dea.continent is not null
--order by 2,3
Select *, (TotalVaccination/population) * 100
From #PercentPopulationVaccinated
-- Creating View to store data for later visualizations
Create view PercentPopulationVaccine as
Select dea.continent, dea.location, dea.date, population, new_vaccinations
, SUM(Convert(float, vac.new_vaccinations)) Over (Partition by dea.location Order by dea.location, dea.date)
as TotalVaccination
From PortfolioProject..CovidDeaths dea
Join PortfolioProject..CovidVaccinations vac
On dea.location = vac.location
and dea.date = vac.date
Where dea.continent is not null
--order by 2,3