* This function is used to check whether two given expressions are equal. * If the given two expressions are equal, the function returns a null value. * If the given two expressions are not equal, ...
> 原文:[https://www . geesforgeks . org/SQL-general-functions-nvl-nvl 2-decode-join-null if-lnnvl-nanvl/](https://www.geeksforgeeks.org/sql-general-functions-nvl ...
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