Recently, we wrote a lot of raw and complex SQL queries for data analysis in our new project, and these queries run on a MySQL database. Then, we notice that it becomes a nightmare to maintain these queries, and we decide to add unit tests to...

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It is a common concern for an ecommerce website that customer might paid twice for a certain order, probably due to user's unawareness, front end bugs or browser unresponsiveness during the transaction, which hurts user experience. Thus, backend...

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