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並前往https://towardsdatascience.com/9-tips-that-helped-me-clear-all-hackerrank-sql-challenges-in-2-weeks-479eb0084862

9 Tips That Helped Me Clear All HackerRank SQL Challenges ...

... brush up my SQL knowledge using the HackerRank coding challenges platform. ... we need to get the data out of those 'dusted' relational databases first.

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