5.20- (Eng) SQL Count, SQL AVG, SQL SUM Functions | SQL Online Course | Microsoft Sql Server | Sql

5.20- (Eng) SQL Count, SQL AVG, SQL SUM Functions | SQL Online Course | Microsoft Sql Server | Sql

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The SQL COUNT(), AVG() and SUM() Functions
The COUNT() function returns the number of rows that matches a specified criterion.

COUNT() Syntax
SELECT COUNT(column_name)
FROM table_name
WHERE condition;
The AVG() function returns the average value of a numeric column.

AVG() Syntax
SELECT AVG(column_name)
FROM table_name
WHERE condition;
The SUM() function returns the total sum of a numeric column.

SUM() Syntax
SELECT SUM(column_name)
FROM table_name
WHERE condition;
COUNT() Example
The following SQL statement finds the number of products:

Example
SELECT COUNT(ProductID)
FROM Products;
Note: NULL values are not counted.

AVG() Example
The following SQL statement finds the average price of all products:

Example
SELECT AVG(Price)
FROM Products;
Note: NULL values are ignored.

Example
SELECT SUM(Quantity)
FROM OrderDetails;
Note: NULL values are ignored. Notes Link:
http://www.tutorialsspace.com/Download-Pdf-Notes/DBMS-Notes.aspx