SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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Try to remove the unneeded ',':
SELECT [location], [date], total_cases, total_deaths, (CAST (total_cases AS float)/CAST (total_deaths AS float))*100 AS DeathPercentage
FROM PortfolioProject..coviddeaths$
ORDER BY [location], [date]