SQL Join Types: Inner Join and Left (Outer) Join

Tables

Table 1: Orders

OrderID

CustomerID

EmployeeID

OrderDate

ShipperID

10308

2

7

1996-09-18

3

10309

37

3

1996-09-19

1

10310

77

8

1996-09-20

2

10365 

1996-11-27 

Note: There is no order in which the CustomerID = 1 (Alfreds Futterkiste).

Table 2 : Customers

CustomerID

CustomerName

ContactName

Address

City

PostalCode

Country

1

Alfreds Futterkiste

Maria Anders

Obere Str. 57

Berlin

12209

Germany

2

Ana Trujillo Emparedados y helados

Ana Trujillo

Avda. de la Constitución 2222

México D.F.

05021

Mexico

3

Antonio Moreno Taquería

Antonio Moreno

Mataderos 2312

México D.F.

05023

Mexico

37 

Hungry Owl All-Night Grocers 

Patricia McKenna 

8 Johnstown Road 

Cork 

 

Ireland

77 

The Big Cheese 

Liz Nixon 

89 Jefferson Way Suite 2 

Portland 

97201 

USA 

Table 3: Shippers

ShipperID

ShipperName

Phone

Speedy Express 

(503) 555-9831 

United Package 

(503) 555-3199 

Federal Shipping 

(503) 555-9931 

Query

If you need a place to try this query, try here: https://www.w3schools.com/sql/trysql.asp?filename=trysql_op_in

SELECT Orders.OrderID, Customers.CustomerName, Shippers.ShipperName
FROM ((Orders
	INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID)
	LEFT JOIN Shippers ON Orders.ShipperID = Shippers.ShipperID)
WHERE Orders.OrderId IN (10308, 10309, 10310, 10365);

Result

OrderID

CustomerName

ShipperName

10308 

Ana Trujillo Emparedados y helados 

Federal Shipping 

10309 

Hungry Owl All-Night Grocers 

Speedy Express 

10310 

The Big Cheese 

United Package 

10365 

Antonio Moreno Taquería 

United Package 

© 2019, Alejandro G. Carlstein Ramos Mejia. All rights reserved.

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