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並前往https://trivadis.github.io/plsql-and-sql-coding-guidelines/v3.6/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4240/

G-4240: Always use a CASE instead of a NVL2 command if ...

The NVL2 function always evaluates all parameters before deciding which one to use. This can be harmful, if parameter 2 or 3 is either a function call or a ...

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