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並前往https://academy.vertabelo.com/course/postgresql-common-functions/other-functions/the-coalesce-function/using-coalesce-in-calculations

Common PostgreSQL Functions | Online Course - Vertabelo ...

SELECT COALESCE(price, 0) * 1.05 FROM product;. This will return each product's price times 1.05 (if there's a price value) or a zero if the price is NULL .

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