Which web app or startup uses them? Well with that question you neatly define the bubble that you inhabit. https://db-engines.com/en/ranking https://db-engine

Which web app or startup uses them? Well with that question you neatly define the bubble that you inhabit. https://db-engines.com/en/ranking https://db-engines.com/en/ranking ranks Oracle at number 1 and MS Sql Server at number 3, their method being a broad range of statistics based on job offers and web search statistics.