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INNER JOIN in SELECT from SQL database (C#, VB and ASP.NET) | Free code

Here you can download free code (C# and VB) for INNER JOIN in a SQL SELECT statement in order to combine data from multiple related tables in one database retrieval.

In a relational database are tables linked to each other with primary keys and foreign keys and this means that you can retrieve data from multiple linked tables in one SELECT statement. A SELECT statement link tables together by the use of an INNER JOIN or an OUTER JOIN.

An INNER JOIN between two tables means that the result list only includes records in the two tables where there is a match according to the condition for an INNER JOIN. If we have a table of cars and another table with types of cars then a INNER JOIN between cars and car types gives a result that only includes those cars with a car type that are included in the types of cars table.

This code for INNER JOIN in a SELECT statement is divided into two files, an aspx page where information from a database are presented and a code page (C# or VB) that contains code for the SQL SELECT statement. The web page for the form is not connected to a "MasterPage", a web project should contain a "MasterPage" that is linked to CSS files so that it becomes easy to maintain the web design for the entire website.

Before you can retrieve data from a database you must have created a database, tables in the database and a named connection string to the database in the "Web.config" file. In this template we have created a connection string to a MySQL database with the name of "ConnectionString" and we make a reference to this connection string when we execute SQL statements.

The code for the SELECT is surrounded by a "Try/Catch/Finally" block and this means that any errors in the code are handled by the web application, it is good to avoid to let errors be handled by the web server for a web host for example.

Remember that you in your web hosting account must have made a setting for the correct version of "ASP.NET" on your website (the version listed in the file "Web.config"). We are using Visual Web Developer 2005 (2010) Express Edition for web programming.
Updated: 01/01/2015 | Created by

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