5.32- SQL Group By Statement | SQL Online Free Course | Microsoft Sql Server | Learn Sql | Sql

5.32- SQL Group By Statement | SQL Online Free Course | Microsoft Sql Server | Learn Sql | Sql

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The SQL GROUP BY Statement
The GROUP BY statement groups rows that have the same values into summary rows, like "find the number of customers in each country".

The GROUP BY statement is often used with aggregate functions (COUNT(), MAX(), MIN(), SUM(), AVG()) to group the result-set by one or more columns.

GROUP BY Syntax
SELECT column_name(s)
FROM table_name
WHERE condition
GROUP BY column_name(s)
ORDER BY column_name(s);

SQL GROUP BY Examples
The following SQL statement lists the number of customers in each country:

Example
SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country;

The following SQL statement lists the number of customers in each country, sorted high to low:

Example
SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
ORDER BY COUNT(CustomerID) DESC;

GROUP BY With JOIN Example
The following SQL statement lists the number of orders sent by each shipper:

Example
SELECT Shippers.ShipperName, COUNT(Orders.OrderID) AS NumberOfOrders FROM Orders
LEFT JOIN Shippers ON Orders.ShipperID = Shippers.ShipperID
GROUP BY ShipperName; Notes Link:
http://www.tutorialsspace.com/Download-Pdf-Notes/DBMS-Notes.aspx