Categories:: Conditional Expression Functions

NVL¶

If expr1 is NULL, returns expr2, otherwise returns expr1.

Aliases: IFNULL

Syntax¶

NVL( <expr1> , <expr2> )

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Arguments¶

expr1: The expression to be checked to see whether it is NULL.
expr2: If expr1 is NULL, this expression is evaluated and its value is returned.

Collation Details¶

The collation specifications of all input arguments must be compatible.
The collation of the result of the function is the highest-precedence collation of the inputs.

Examples¶

Call NVL with both NULL and non-NULL values for the first expression:

SELECT NVL('food', 'bard') AS col1, NVL(NULL, 3.14) AS col2;

+------+------+
| COL1 | COL2 |
+------+------+
| food | 3.14 |
+------+------+

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