SQL INNER JOIN

SQL INNER JOIN Explained

SQL INNER JOIN combines records from two tables.

An INNER JOIN matches column values in 2 tables.

A query can contain zero, one, or multiple JOIN operations.

SQL INNER JOIN

Example

#

List all suppliers with their products.

SELECT CompanyName, ProductName
  FROM Supplier 
 INNER JOIN Product ON Supplier.Id = Product.SupplierId

Syntax

INNER JOIN syntax.

SELECT column-names
  FROM table-name1 
 INNER JOIN table-name2 ON column-name1 = column-name2
 WHERE condition

The INNER keyword is the default and is optional.
INNER JOINs are the most commonly used form of JOIN operations.


More Examples

SQL INNER JOIN with 2 tables

CUSTOMER
Id
FirstName
LastName
City
Country
Phone
ORDER
Id
OrderDate
OrderNumber
CustomerId
TotalAmount
Problem: List all orders with customer information.
SELECT OrderNumber, TotalAmount, FirstName, LastName, City, Country
  FROM [Order] 
 INNER JOIN Customer ON [Order].CustomerId = Customer.Id
Result:  830 records.
OrderNumber TotalAmount FirstName LastName City Country
542378 440.00 Paul Henriot Reims France
542379 1863.40 Karin Josephs Münster Germany
542380 1813.00 Mario Pontes Rio de Janeiro Brazil
542381 670.80 Mary Saveley Lyon France
542382 3730.00 Pascale Cartrain Charleroi Belgium
542383 1444.80 Mario Pontes Rio de Janeiro Brazil
542384 625.20 Yang Wang Bern Switzerland

SQL INNER JOIN with 3 tables

Problem: List all orders with product names, quantities, and prices.
PRODUCT
Id
ProductName
SupplierId
UnitPrice
Package
IsDiscontinued
ORDERITEM
Id
OrderId
ProductId
UnitPrice
Quantity
ORDER
Id
OrderDate
OrderNumber
CustomerId
TotalAmount

SELECT O.OrderNumber, CONVERT(date,O.OrderDate) AS Date, 
       P.ProductName, I.Quantity, I.UnitPrice 
  FROM [Order] O 
 INNER JOIN OrderItem I ON O.Id = I.OrderId 
 INNER JOIN Product P ON P.Id = I.ProductId
 ORDER BY O.OrderNumber

This query performs two INNER JOIN operations with 3 tables.
The O, I, and P are table Aliases. Date is a column Alias.

Result:  2155 records
OrderNumber Date ProductName Quantity UnitPrice
542378 7/4/2012 12:00:00 AM Queso Cabrales 12 14.00
542378 7/4/2012 12:00:00 AM Singaporean Hokkien Fried Mee 10 9.80
542378 7/4/2012 12:00:00 AM Mozzarella di Giovanni 5 34.80
542379 7/5/2012 12:00:00 AM Tofu 9 18.60
542379 7/5/2012 12:00:00 AM Manjimup Dried Apples 40 42.40
542380 7/8/2012 12:00:00 AM Jack's New England Clam Chowder 10 7.70
542380 7/8/2012 12:00:00 AM Manjimup Dried Apples 35 42.40
542380 7/8/2012 12:00:00 AM Louisiana Fiery Hot Pepper Sauce 15 16.80
542381 7/8/2012 12:00:00 AM Gustaf's Knäckebröd 6 16.80
542381 7/8/2012 12:00:00 AM Ravioli Angelo 15 15.60
542381 7/8/2012 12:00:00 AM Louisiana Fiery Hot Pepper Sauce 20 16.80
542382 7/9/2012 12:00:00 AM Sir Rodney's Marmalade 40 64.80
542382 7/9/2012 12:00:00 AM Geitost 25 2.00

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