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SQL Functions




Count function

Description

In SQL Server (Transact-SQL), the COUNT function returns the count of an expression.

Syntax

The syntax for the COUNT function in SQL Server (Transact-SQL) is:
SELECT COUNT(aggregate_expression)
FROM tables
[WHERE conditions];
OR the syntax for the COUNT function when grouping the results by one or more columns is:
SELECT expression1, expression2, ... expression_n,
       COUNT(aggregate_expression)
FROM tables
[WHERE conditions]
GROUP BY expression1, expression2, ... expression_n;

Parameters or Arguments

expression1, expression2, ... expression_n
Expressions that are not encapsulated within the COUNT function and must be included in the GROUP BY clause at the end of the SQL statement.
aggregate_expression
This is the column or expression whose non-null values will be counted.
tables
The tables that you wish to retrieve records from. There must be at least one table listed in the FROM clause.
WHERE conditions
Optional. These are conditions that must be met for the records to be selected.

SUM Function

Syntax

The syntax for the SUM function in SQL Server (Transact-SQL) is:
SELECT SUM(aggregate_expression)
FROM tables
[WHERE conditions];
OR the syntax for the SUM function when grouping the results by one or more columns is:
SELECT expression1, expression2, ... expression_n,
       SUM(aggregate_expression)
FROM tables
[WHERE conditions]
GROUP BY expression1, expression2, ... expression_n;

Parameters or Arguments

expression1, expression2, ... expression_n
Expressions that are not encapsulated within the SUM function and must be included in the GROUP BY clause at the end of the SQL statement.
aggregate_expression
This is the column or expression that will be summed.
tables
The tables that you wish to retrieve records from. There must be at least one table listed in the FROM clause.
WHERE conditions
Optional. These are conditions that must be met for the records to be selected.

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