Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind MySQL IFNULL() Function?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ IFNULL(NULL, "ExampleSite.com");3Order
Put the learning moves in the order that makes the concept easiest to apply.
The IFNULL() function returns a specified value if the expression is NULL.
Definition and Usage
MySQL IFNULL() Function
Example
SELECT IFNULL(NULL, "ExampleSite.com");Definition and Usage
The IFNULL() function returns a specified value if the expression is NULL.
If the expression is NOT NULL, this function returns the expression.
Syntax
IFNULL(
expression
,
alt_value
)Parameter Values
| Parameter | Description |
|---|---|
| expression | Required. The expression to test whether is NULL |
| alt_value | Required. The value to return if expression is NULL |
Technical Details
| Works in: | From MySQL 4.0 |
|---|