Bugl — code interview practice that feels like a game

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Flash cards

Review the key moves

1/4

Core idea

What is the main idea behind SQL Server COUNT() Function?

Lesson checks

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

SQL Server COUNT() Function

Example

SELECT COUNT(ProductID) AS NumberOfProducts FROM Products;

The COUNT() function returns the number of records returned by a select query.

Note

NULL values are not counted.

Syntax

COUNT
(expression
)

Parameter	Description
expression	Required. A field or a string value

Works in:	SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse