Search results
Summary: in this tutorial, you will learn how to use the Oracle NVL2() function to substitute a null value with different options. Oracle NVL2() function overview The Oracle NVL2() function is an extension of the NVL() function with different options based on whether a NULL value exists.
The NVL2 function returns the value returned by a query based, if the expression is null or not null. If expression1 is not null, then NVL2 returns expression2. If expression1 is null, then NVL2 returns expression3.
This Oracle tutorial explains how to use the Oracle / PLSQL NVL2 function with syntax and examples. The Oracle / PLSQL NVL2 function extends the functionality found in the NVL function.
29 kwi 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.
Use NVL2 when you wish to specify alternate values to be returned for the case when an expression is NULL, and also for the case when an expression is not NULL. The NVL function is most commonly used to substitute a default value when a column is NULL.
10 cze 2019 · This SQL tutorial provides explanations, examples for NVL2 function in Oracle. NVL2 function is a nesting function .It examines the first impression, if the the first impression is not null ,then NVL2 function returns the second expression. if the first impression is null, then it return the third expression.
23 wrz 2011 · see how the optimizer guesses correctly for "owner = 'SCOTT'" and even owner = nvl ('SCOTT',owner) (there is an NVL optimization in there). But for NVL2 - it doesn't see the rewrite opportunity and has to guess at the number of rows.
