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‎COVID-SQL-Data-Exploration.sql‎

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/*
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Covid 19 Data Exploration
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Skills used: Joins, CTE's, Temp Tables, Windows Functions, Aggregate Functions, Creating Views, Converting Data Types
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*/
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SELECT *
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FROM PortfolioProject..CovidDeaths
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WHERE continent is not null
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ORDER BY 3,4
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--Select *
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--From PortfolioProject..CovidVaccinations
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--Order By 3,4
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SELECT location,
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date,
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total_cases,
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new_cases,
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total_deaths,
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population
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FROM PortfolioProject..CovidDeaths
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ORDER BY 1,2
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-- Looking at Total Cases vs Total Deaths
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Select location,
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date,
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total_cases,
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total_deaths,
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(CAST(total_deaths AS decimal)/total_cases)*100 AS DeathPercentage
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FROM PortfolioProject..CovidDeaths
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WhERE location LIKE '%states%'
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ORDER BY 1,2
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-- Looking at Total Cases vs Population
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-- Shows what percentage of population got Covid
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SELECT location,
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date,
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population,
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total_cases,
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(CAST(total_cases AS decimal)/population)*100 AS PercentagePopulationEffected
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FROM PortfolioProject..CovidDeaths
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WHERE location LIKE '%states%'
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ORDER BY 1,2
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-- Looking at Countries with Highest Infection Rate compared to Population
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SELECT location,
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population,
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MAX(total_cases) AS HighestInfectionCount,
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(MAX(total_cases) / population)*100 AS PercentagePopulationEffected
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FROM PortfolioProject..CovidDeaths
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GROUP BY location, population
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ORDER BY PercentagePopulationEffected DESC
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-- Showing Countries with Highest Death Rate
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SELECT location,
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MAX(CAST(total_deaths AS int)) AS TotalDeathCount
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FROM PortfolioProject..CovidDeaths
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WHERE continent IS NOT NULL
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GROUP BY location
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ORDER BY TotalDeathCount DESC
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-- Showing Continent (and various group) Death Rates
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SELECT location,
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MAX(CAST(total_deaths AS int)) AS TotalDeathCount
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FROM PortfolioProject..CovidDeaths
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WHERE continent IS NULL
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GROUP BY location
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ORDER BY TotalDeathCount DESC
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-- Global Numbers
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SELECT SUM(new_cases) AS total_cases,
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SUM(CAST(new_deaths AS int)) AS total_deaths,
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SUM(CAST(new_deaths AS int))/SUM(new_cases)*100 AS DeathPercentage
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FROM PortfolioProject..CovidDeaths
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WHERE Continent IS NOT NULL
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ORDER BY 1, 2
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-- Getting a rolling tally by country of number of people vaccinated, and a rolling tally
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-- of the percentage of the population that is vaccinated.
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-- Using a CTE.
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WITH PopvsVac (Continent, Location, Date, Population, New_Vaccinations, RollingPeopleVaccinated)
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AS
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(
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SELECT dea.continent,
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dea.location,
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dea.date,
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dea.population,
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vac.new_vaccinations,
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SUM(CONVERT(bigint, vac.new_vaccinations))
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OVER (PARTITION BY dea.location
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ORDER BY dea.location, dea.date) AS RollingPeopleVaccinated
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FROM PortfolioProject..CovidDeaths dea
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JOIN PortfolioProject..CovidVaccinations vac
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ON dea.location = vac.location
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AND dea.date = vac.date
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WHERE dea.continent IS NOT NULL
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-- Order By 2, 3
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)
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SELECT *, (RollingPeopleVaccinated/Population)*100 AS PctPeopleVaccinated
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FROM PopvsVac
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-- Getting a rolling tally by country of number of people vaccinated, and a rolling tally
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-- of the percentage of the population that is vaccinated.
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-- Using a Temp Table.
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CREATE TABLE #PercentPeopleVaccinated
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(
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Continent nvarchar(255),
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Location nvarchar(255),
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Date datetime,
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Population numeric,
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New_Vaccinations numeric,
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RollingPeopleVaccinated numeric
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)
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INSERT INTO #PercentPeopleVaccinated
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SELECT dea.continent,
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dea.location,
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dea.date,
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dea.population,
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vac.new_vaccinations,
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SUM(CONVERT(bigint, vac.new_vaccinations))
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OVER (PARTITION BY dea.location
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ORDER BY dea.location, dea.date) AS RollingPeopleVaccinated
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FROM PortfolioProject..CovidDeaths dea
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JOIN PortfolioProject..CovidVaccinations vac
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ON dea.location = vac.location
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AND dea.date = vac.date
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WHERE dea.continent IS NOT NULL
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-- Order By 2, 3
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SELECT *, (RollingPeopleVaccinated/Population)*100 AS PctPeopleVaccinated
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FROM #PercentPeopleVaccinated
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-- Creating some Views to use later in visualizations. Commenting out Order By as can't use when setting up a view.
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-- Including it instead in the Select statement that displays everything from the newly created view.
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CREATE VIEW PercentPeopleVaccinated AS
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SELECT dea.continent,
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dea.location,
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dea.date,
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dea.population,
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vac.new_vaccinations,
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SUM(CONVERT(bigint, vac.new_vaccinations))
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OVER (PARTITION BY dea.location
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ORDER BY dea.location, dea.date) AS RollingPeopleVaccinated
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FROM PortfolioProject..CovidDeaths dea
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JOIN PortfolioProject..CovidVaccinations vac
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ON dea.location = vac.location
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AND dea.date = vac.date
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WHERE dea.continent IS NOT NULL
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-- Order By 2, 3
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SELECT *
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FROM PercentPeopleVaccinated
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Order By 2, 3
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CREATE VIEW CountryDeaths AS
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SELECT location,
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MAX(CAST(total_deaths AS int)) AS TotalDeathCount
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FROM PortfolioProject..CovidDeaths
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WHERE continent IS NOT NULL
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GROUP BY location
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-- ORDER BY TotalDeathCount DESC
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SELECT *
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FROM CountryDeaths
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ORDER BY TotalDeathCount DESC
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CREATE VIEW ContinentDeaths as
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SELECT location,
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MAX(CAST(total_deaths AS int)) AS TotalDeathCount
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FROM PortfolioProject..CovidDeaths
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WHERE continent IS NULL
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GROUP BY location
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-- ORDER BY TotalDeathCount DESC
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SELECT *
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FROM ContinentDeaths
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ORDER BY TotalDeathCount DESC

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