Web Reference: The COALESCE() function is the preferred standard for handling potential NULL values. The COALESCE() function returns the first non-NULL value in a list of values. The Oracle NVL()function allows you to replace null with a more meaningful alternative in the results of a query. The following shows the syntax of the NVL()function: The NVL() function accepts two arguments. If e1 evaluates to null, then NVL() function returns e2. If e1 evaluates to non-null, the NVL() function returns e1. The two arguments e1 and... This Oracle tutorial explains how to use the Oracle / PLSQL NVL function with syntax and examples. The Oracle / PLSQL NVL function lets you substitute a value when a null value is encountered.
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