Golang

You need to describe the library model. There are 3 entities: "Author", "Book", "Reader" -- Physically, there is only one book and it can only be with one reader. You need to create tables for the library to reflect this. -- A book can have multiple authors.

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What index should be added for a search query for free books? Why is each field included in the composite index? How will the index perform with 2 million rows?

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Tell me about software development methodologies.

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