Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind MySQL COUNT() 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.
___ COUNT(ProductID) AS NumberOfProducts FROM Products;3Order
Put the learning moves in the order that makes the concept easiest to apply.
The COUNT() function returns the number of records returned by a select query.
Definition and Usage
MySQL COUNT() Function
Example
SELECT COUNT(ProductID) AS NumberOfProducts FROM Products;Definition and Usage
The COUNT() function returns the number of records returned by a select query.
Note
NULL values are not counted.
Syntax
COUNT(
expression
)Parameter Values
| Parameter | Description |
|---|---|
| expression | Required. A field or a string value |
Technical Details
| Works in: | From MySQL 4.0 |
|---|