First of all you have to make sure, that your PHP server is able to conect to Microsoft SQL server at all. This requires a PHP extension named SQLSRV which you can download from the Microsoft's official website and unfortunately only works on newer versions of Windows OS.
You will have to add a line to your php.ini file to tell your PHP script to use the extension. Depepending on your PHP installation you have to use one of the four extension files: php_sqlsrv_53_ts.dll, php_sqlsrv_53_nts.dll, php_sqlsrv_54_ts.dll or php_sqlsrv_54_nts.dll, where ts stands for Thread Safe and nts for Not Thread Safe. If you are not sure which one to use you can go to your Joomla Adninistration > Site > System Information > PHP Information and check your PHP version and a parameter called Thread Safety. Finally you open your php.ini file and insert a new line:
extension=php_sqlsrv_54_ts.dll
In the next step you will have to install a software called Microsoft SQL Server 2012 Native Client, to make the connection work. This is also freely available from Microsoft's website or you can use the download links on the official PHP website.
Now restart your PHP server and you should be good to go.
If you use a shared hosting, you should get in contact with your hosting provider, to set up environment for you.
To connect to a another database than the one thar Joomla uses, you have to select "Other" connection by using the radio button in the "Connection" area. Next, you fill in the connection data. To connect to MSSQL database using SQLSRV use the Database Type "sqlsrv". Other settings are straightforward. Fill in the host address (domain or IP address), database User and Password and Database Name.
On the end hit the "Check and List Tables" button, to test the connection. If ewerything is set properly a dropdown box should appear on the right with all the tables listed. Now you can proceed with selecting the table and columns.
To connect to a another database than the one thar Joomla uses, you have to select "Other" connection by using the radio button in the "Connection" area. Next, you fill in the connection data. To connect to mysql database use the Database Type "mysql" or "mysqli" if you are connecting to MySQLi database. For other databases see below. Other settings are straightforward. Fill in the host address (domain or IP address), database User and Password and Database Name.
On the end hit the "Check and List Tables" button, to test the connection. If ewerything was allright a dropdown box should appear on the right with all the tables listed. Now you are able to proceed with selecting the table and columns.
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A view can be created by running a CREATE VIEW command on your database.
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Minor releases include bug fixes and some minor updates and are available for free once you have purchased a product. Major releases are issued as new products, therefore another purchase is needed to download them. Major releases usually follow up major Joomla! releases, i.e. Table JX 3.1 for Joomla 3.0+ will be a major release.
The best way to pull data from multiple database tables is to create a Database View where the tables are joined and than to use this view with Tools JX.
SP_READ_MOREA Database view is an object in SQL database.
You can create it by executing a CREATE VIEW command on your database. It is used to format, and combine data from multiple tables in one single table, which is not a real table since it just collects and formats data from other tables. But other applications that connect to the database they threat a table or a view in the same way. So in case of Table JX a database view will show up on the list among with all other tables after it is created.
The very basic example of an SQL command to create a View "ViewName" that puls data from "Table1" and "Table2" which are connected by fields Table1.ID and Table2.ID:
CREATE VIEW ViewName AS
WHERE t1.ID = t2.ID
For more information about views please refer to mysql documentation: dev.mysql.com/doc/refman/5.0/en/create-view.html