Northwind Database Sql Queries

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*Sql Queries Tutorial
*Northwind Database Sql Queries Examples
*Northwind Database Script Sql
*Northwind Database Sql Queries Free
*Queries In Sql
*Northwind Database Sql Queries Download
Northwind is the name of the sample database for SQL Server 2000, that later got replaced with the AdventureWorks sample database in SQL Server 2005. However, it is still used in e.g. Microsoft SQL Server 2008 Database Development Training Kit so may still be relevant for users trying to learn SQL essentials. The following code example queries the Northwind database for the product with the ProductID value of 27. The value returned is an instance of the Product class, and the Console.WriteLine statement prints the name of the product.
*northwindMySQL
Sql Queries Tutorial
Description
A step-by-step tutorial for importing the Northwind Access Database into MySQL.
Discussion
The Northwind database is a Microsoft Access database that ships with Alpha Anywhere. In order to perform CRUD (Create, Read, Update, Delete) operations on the Northwind Access database, the database must be copied to a directory where you have read/write access or converted to another database format. The Northwind Access database can be found inside the MDBFiles directory in your Alpha Anywhere installation. Your Alpha Anywhere install is typically located at C:Program Files (x86)a5v12. In this tutorial, you will learn how to convert the Northwind Access database to a MySQL database.This tutorial demonstrates importing the Northwind database into MySQL Server using MySQL Workbench 6.3 CE.
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Download the northwindmysql.zip file and extract its contents somewhere on your computer. The .zip contains the Northwind Access database in a self-contained SQL file named ’northwindmysql.sql’.
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Open MySQL Workbench. Under Management, open the Data Import/Restore tool.
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On the Import from Disk tab, select Import from Self-Contained File. Use the browse button to select the northwindmysql.sql file you extracted from the download in the first step.
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Select the Default Target Schema:. The northwindmysql.sql file does not have a target schema. Use the New button to create a new target schema named ’northwind’.
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Click the Start Import button to import the Northwind database into the selected target schema. The Import Progress tab will display the progress of the import.
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You should now see a list of tables in the northwind schema. The Northwind database is now imported into MySQL.Build a MySQL Connection String
Now that the Northwind database has been imported into MySQL, the next step is to create a Connection String to the database.
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From the Web Projects Control Panel, select [ManageConnStr] Manage Connection Strings > Alpha DAO Connection strings from the Edit menu to create a new connection string.
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Click the New button to create a new connection string. Type in ’Northwind’ for the Connection Name and click the Build button to construct the Connection String.Creating a new connection to the Northwind MySQL database.
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Select MySQL from the list of options in the Select an API window and click OK.
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Configure the MySQL Options for the connection. Choose the Version of MySQL that is installed.
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Enter ’localhost’ in Hostname. If the MySQL database is hosted on another computer, enter the host IP address. For example, 127.0.0.1.
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Enter the MySQL Port Pos 58mm receipt template. number. The default port number for a typical MySQL installation is ’3306’.
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Enter the User for accessing the MySQL database. On your development machine, this can be ’root’ or a user account you created.
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Enter the password for the User account specified.
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Verify the connection to MySQL is correct by clicking the Test Connection button. You should see a success message. If you receive an error message, verify the Hostname, Port, User, and Password are correct.Success! The connection string to the MySQL database works.
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Select the MySQL Northwind database you created from the Database list. If Database does not have any options, click the Refresh button. If it still does not list any databases, verify the User you have chosen has access to the MySQL Northwind database.Configuring the MySQL connection string. The Northwind database in this MySQL instance is named ’northwind’.
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Click OK to create the MySQL connection string.
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Click OK to save the new Northwind connection string.
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Click the Close button to exit the AlphaDAO Connections dialog. You can now build a mobile or web application that communicates with the Northwind MySQL database. Click here for a list of tutorials that use the Northwind database.The Northwind AlphaDAO connection string for MySQL
See Also
Subqueries
Subqueries can be characterized in two main ways. One is by the expected number of values (either scalar or multivalued), and another is by the subquery’s dependency on the outer query (either self-contained or correlated). Both scalar and multivalued subqueries can be either self-contained or correlated.Northwind Database Sql Queries Examples
Self-Contained Subqueries
A self-contained subquery is a subquery that can be run independently of the outer query. Self-contained subqueries are very convenient to debug, of course, compared to correlated subqueries.
Scalar subqueries can appear anywhere in the query where an expression resulting in a scalar value is expected, while multivalued subqueries can appear anywhere in the query where a collection of multiple values is expected.
A scalar subquery is valid when it returns a single value, and also when it returns no valuesin which case, the value of the subquery is NULL. However, if a scalar subquery returns more than one value, a run-time error will occur.Northwind Database Script Sql
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Logically, a self-contained subquery can be evaluated just once for the whole outer query. Physically, the optimizer can consider many different ways to achieve the same thing, so you shouldn’t think in such strict terms.
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Correlated Subqueries
Correlated subqueries are subqueries that have references to columns from the outer query. Logically, the subquery is evaluated once for each row of the outer query. Again, physically, it’s a much more dynamic process and will vary from case to case. There isn’t just one physical way to process a correlated subquery.
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Let’s start with the basic request to return the orders with the maximum OrderDate for each employee. Here you can get multiple rows for each employee because an employee can have multiple orders with the same order date.
You might be tempted to use this solution, which includes a self-contained subquery similar to the one used to return orders on the last actual order date of the month:Northwind Database Sql Queries Free
SELECT OrderID, CustomerID, EmployeeID, OrderDate, RequiredDate
FROM dbo.Orders
WHERE OrderDate IN
(SELECT MAX(OrderDate) FROM dbo.Orders
GROUP BY EmployeeID);Queries In Sql
However, this solution is incorrect. The result set will include the correct orders (the ones with the maximum OrderDate for each employee). But you will also get any order for employee A with an OrderDate that happens to be the maximum for employee B, even though it’s not also the maximum for employee A. This wasn’t an issue with the previous problem, as an order date in month A can’t be equal to the maximum order date of a different month B.
In our case, the subquery must be correlated to the outer query, matching the inner EmployeeID to the one in the outer row:Northwind Database Sql Queries Download
SELECT OrderID, CustomerID, EmployeeID, OrderDate, RequiredDate
FROM dbo.Orders AS O1
WHERE OrderDate =
(SELECT MAX(OrderDate)
FROM dbo.Orders AS O2
WHERE O2.EmployeeID = O1.EmployeeID);
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