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並前往https://blog.josephscott.org/2006/03/15/nvl-isnull-ifnull-and-coalesce/

NVL, ISNULL, IFNULL and COALESCE - Joseph Scott

This is an area of bizarre inconsistency across database engines. In PostgreSQL, and in Redshift, the NVL() function is a synonym for COALESCE.

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