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COVID Portfolio Project.sql
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COVID Portfolio Project.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
-- Selecting Data that we are going to start with
SELECT location, date, total_cases, new_cases, total_deaths, population
FROM PortfolioProject..CovidDeaths
WHERE continent is NOT NULL
ORDER BY 1,2
-- Looking at Total Cases vs Total Deaths
-- Shows the likelihood of dying if you contract covid in my country
SELECT location, date, total_cases, total_deaths, ROUND((total_deaths/total_cases)*100, 2) AS DeathPercentage
FROM PortfolioProject..CovidDeaths
WHERE location='Jamaica'
ORDER BY 1,2
-- Total Cases vs Population
-- Shows what percentage of the population got Covid
SELECT location, date, total_cases, population, ROUND((total_cases/population)*100, 5) AS CasesByPopulation
FROM PortfolioProject..CovidDeaths
--WHERE location='Jamaica'
ORDER BY 1,2
-- Countries with Highest Infection Rate compared to Population
SELECT location, population, MAX(total_cases) AS HighestInfectionCount, ROUND(MAX((total_cases/population))*100,2) AS PercentPopulationInfected
FROM PortfolioProject..CovidDeaths
--WHERE location='Jamaica'
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 PortfolioProject..CovidDeaths
WHERE continent IS NOT NULL
GROUP BY location
ORDER BY TotalDeathCount DESC
-- Breaking things down by Continent
-- Continents with Highest Death Count per Population
SELECT continent, MAX(CAST(total_deaths AS int)) AS TotalDeathCount
FROM PortfolioProject..CovidDeaths
WHERE continent IS NOT NULL
GROUP BY continent
ORDER BY TotalDeathCount DESC
-- Global Numbers by date
SELECT date, SUM(new_cases) AS TotalCases, SUM(cast(new_deaths AS int)) AS TotalDeaths, ROUND((SUM(cast(new_deaths AS int))/SUM(new_cases))*100, 2) AS DeathPercentage
FROM PortfolioProject..CovidDeaths
WHERE continent is NOT NULL
GROUP BY date
ORDER BY 1,2
-- Global Numbers overall
SELECT SUM(new_cases) AS TotalCases, SUM(cast(new_deaths AS int)) AS TotalDeaths, ROUND((SUM(cast(new_deaths AS int))/SUM(new_cases))*100, 2) AS DeathPercentage
FROM PortfolioProject..CovidDeaths
WHERE continent is NOT NULL
--GROUP BY date
ORDER BY 1,2
-- Total Population vs Vaccinations
-- Percentage of Population that has received at least one Covid Vaccine
SELECT dea.continent, dea.location, dea.date, dea.population, vax.new_vaccinations
, SUM(CONVERT(int,vac.new_vaccinations)) OVER (Partition by dea.Location Order by dea.location, dea.Date) as RollingPeopleVaccinated
FROM PortfolioProject..CovidDeaths dea
JOIN PortfolioProject..CovidVaccinations vax
ON dea.location = vax.location
AND dea.date = vax.date
WHERE dea.continent IS NOT NULL
ORDER BY 2,3
-- Using CTE to perform calculation on partition by previous query
WITH PopulationvsVaccinations (Continent, Location, date, Population, New_Vaccinations, RollingPeopleVaccinated)
AS
(
SELECT dea.continent, dea.location, dea.date, dea.population, vax.new_vaccinations, SUM(CONVERT(int,vax.new_vaccinations)) OVER (Partition by dea.location ORDER BY dea.location, dea.date) AS RollingPeopleVaccinated
FROM PortfolioProject..CovidDeaths dea
JOIN PortfolioProject..CovidVax vax
ON dea.location = vax.location
and dea.date = vax.date
WHERE dea.continent is NOT NULL
)
SELECT *, ROUND((RollingPeopleVaccinated/Population)*100,2) AS RollingPercent
FROM PopulationvsVaccinations
--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 dea.continent, dea.location, dea.date, dea.population, vax.new_vaccinations, SUM(CONVERT(int,vax.new_vaccinations)) OVER (Partition by dea.location ORDER BY dea.location, dea.date) AS RollingPeopleVaccinated
FROM PortfolioProject..CovidDeaths dea
JOIN PortfolioProject..CovidVax vax
ON dea.location = vax.location
and dea.date = vax.date
WHERE dea.continent is NOT NULL
SELECT *, ROUND((RollingPeopleVaccinated/Population)*100,2) AS RollingPercent
FROM #PercentPopulationVaccinated
-- Creating View to store data for later visualisations
CREATE View PercentPopulationVaccinated as
SELECT dea.continent, dea.location, dea.date, dea.population, vax.new_vaccinations, SUM(CONVERT(int,vax.new_vaccinations)) OVER (Partition by dea.location ORDER BY dea.location, dea.date) AS RollingPeopleVaccinated
FROM PortfolioProject..CovidDeaths dea
JOIN PortfolioProject..CovidVax vax
ON dea.location = vax.location
and dea.date = vax.date
WHERE dea.continent is NOT NULL