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SQL - Free Certificate: https://openclassrooms.com/en/courses/6031801-implement-a-relational-database-with-sql
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MySQL - Free Certificate: https://www.simplilearn.com/free-online-course-to-learn-sql-basics-skillup
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PostgreSQL - Free Certificate: https://www.freecodecamp.org/learn/relational-database/
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SQL Server: https://learn.microsoft.com/en-us/training/paths/program-transact-sql/
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Oracle - Free Certificate: https://www.mygreatlearning.com/academy/learn-for-free/courses/oracle-sql
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If you work in data, you’ll write SQL queries all the time. So how do you write efficient SQL queries that are optimized for performance
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