mdf file of your NorthWind databases files from the folders. Step 2 : Open your SQL Management Studio and select Attach Database option from the menu of the connected server.
Northwind database sql queries download#
It represents a Transact-SQL statement or stored procedure to execute against a SQL Server database.įinally, Use the SqlDataAdapter class to read the data and fill in your DataTable object, and then bind it to your DataGridView. If you directly want the script file or BAK file, download Northwind database script. able to easily connect to a SQL database, inspect the tables, and execute queries. You can easily add query parameters to SqlCommand using the AddWithValue method. The following ERD Diagram describes the Northwind Traders Database. Step 5 : After a successful execution of the Query, you should find your newly populated database. Step 2 : Open the script in a new query window. Next, use the SqlCommand class to execute your SQL query. Step 1 : In SQL Server Management Studio, connect to an instance of the SQL Server Database Engine. Whitespace and Semi-colons Whitespace is ignored in SQL statements. You can create a new DataTable to help you store the data returned from the sql query. Introduction to the Northwind Database The Northwind database is a sample database. If the connection is closed you need to open it. You can use the SqlConnection class to make a connection to your database, and don't forget to check your sql connection status.
Northwind database sql queries code#
You should use try catch to catch errors if something goes wrong, then write your code in this try catch block. MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error) Using (SqlCommand cmd = new SqlCommand("select *from customers where or contactname like cn))Ĭmd.Parameters.AddWithValue("customerid", txtSearch.Text) Ĭmd.Parameters.AddWithValue("contactname", string.Format("%" Using (DataTable dt = new DataTable("Customer")) Using (SqlConnection cn = new SqlConnection()) Next, use the SqlCommand class to execute your SQL query. You can create a new DataTable to help you store the data returned from the sql query. (b) Name of employees and name of customers located in Brussels related through orders that are sent by Speedy Express. In this tutorial, I will use the Northwind database to play my demo, if you dont have the Northwind database in your SQL Server yet. (a) Name, address, city, and region of employees. Write in relational algebra queries (a)(g) and in SQL all the queries. private void btnSearch_Click(object sender, EventArgs e) Consider the following queries to be addressed to the Northwind database. This library helps you to read your connection string from the app.config file.Īdding a click event handler to the Search button allows you to search data from sql database, then display data to DataGridView. Using the app.config file to store the connection string makes it easy to change the connection string without modifying your source code.Īnd don't forget to add a reference to the library to your project.
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