Web Reference: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. Learn the difference between NVL, NVL2, and COALESCE functions in SQL. See examples and syntax for each function and when to use each one. Get tips on how to optimize your queries for better performance. Apr 29, 2016 · Both the NVL (exp1, exp2) and NVL2 (exp1, exp2, exp3) functions check the value exp1 to see if it is null. With the NVL (exp1, exp2) function, if exp1 is not null, then the value of exp1 is returned; otherwise, the value of exp2 is returned, but case to the same data type as that of exp1.
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