Ifnull in MySQL

Source: Internet
Author: User

MySQL ifnull function is one of the MySQL control flow functions, he accepts two parameters, if the first parameter is not empty return the first argument, otherwise play the second argument.

Two arguments can be literal values, or expressions

Ifnull (expression_1,expression_2); returns expression_1 if expression_1 is not empty, otherwise returns expression_2,

If you want to return a value based on true or false, use if instead of ifull

Here's an example:

Select Ifnull (1,0)----return 1;

Select Ifnull ("", 0)----return "";

Select Ifnull (null,0)---return 0;

Ifnull in MySQL

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