How to join two tables from different databases

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How to join two tables from different databases. One database is localhost, the other is in online.

$connectA = mysql_connect('localhost','root','','abc');
$connectB = mysql_connect('xxx','yyy','zzz','xyz');

I want to join department_name from table department which is having database abc and xyz.


You cannot as long as by join you mean using SQL JOINS. It is, because SQL query is always sent to specific database or server.

You need to send two independent queries, one for each database and then provide some logic in PHP to join them either by array_merge (full join) or some more advanced scripting.

Can't help more without seeing some code of your own.

Performing a Join Between Tables in Different Databases, Sometimes it's necessary to perform a join on two tables that are located in different databases. To do this, qualify table and column names sufficiently so that  There are 2 steps to join tables from different servers. The first step is to link the SQL Servers. The next and the last step is to join the tables using the select query having the server name as prefix for the table name.


As already has been said, it is not possible. I would save the database connections and switch between the databases.

Just a simple example (and with mysqli)

$db1 = mysqli_connect("localhost", "my_user", "my_password", "world");
$db2 = mysqli_connect("localhost2", "my_user2", "my_password2", "world2");

And then when you want to execute a query

mysqli_query($db1, "SELECT * ...");

or other database

mysqli_query($db2, "SELECT * ...");

Save the results from your query's in arrays and then use for example array_merge to join them.

http://php.net/manual/en/function.array-merge.php

SQL Server: Joining Tables from Different Databases on the Same , Joining these two tables in a select query is very simple. The select query will be similar to the one we normally use to select data from multiple  Methods to Join Multiple Tables. One simple way to query multiple tables is to use a simple SELECT statement. You can call more than one table by using the FROM clause to combine results from multiple tables. Syntax: SELECT table1.column1, table2.column2 FROM table1, table2 WHERE table1.column1 = table2.column1;


How to join tables from different databases in SQL select statement , Get two DataSets for them, then merge two datatables into one based on usersID. Hope it gives you some idea. "Object reference not set to an  2 Answers 2. SQL Server allows you to join tables from different databases as long as those databases are on the same server. The join syntax is the same; the only difference is that you must fully specify table names. Let's suppose you have two databases on the same server - Db1 and Db2.


Use can use database federation (data virtualization) technologies like Teiid http://teiid.io and join the tables across the databases or even data from files and web services.

How to join two tables from different database using sql query , if they are in the same instance use this statment. Hide Copy Code. select * from Database1.dbo.Table1 t1 inner join Database2.dbo.Table2 t2  In all three queries, table1 and table2 are the tables to be joined. You can join more than two tables. In both queries, col1 and col2 are the names of the columns being matched to join the tables. The tables are matched based on the data in these columns.


How to Join Tables from Different Databases in SQL Select, Hi, I am trying to join two different tables from two different databases running on two different servers. I can set up the two different connections,  To join tables from different databases In Tableau Desktop: On the Start page, under Connect, click a connector to connect to your data. Select the file, database, or schema, and then double-click or drag a table to the canvas. In the left pane, under Connections, click the Add button ( in web


Joining two tables two different databases, To join tables from two different databases, we can use fully qualified names of the tables in this format. A JOIN clause is used to combine rows from two or more tables, based on a related column between them. Notice that the "CustomerID" column in the "Orders" table refers to the "CustomerID" in the "Customers" table. The relationship between the two tables above is the "CustomerID" column. Then, we can create the following SQL statement (that


JOIN two tables from two different databases - Databases, The database prefix can also be employed to combine different databases within one SELECT statement's table list, as specified after the  This article explains how to join two different tables from two different databases, or we may say how to join two tables from two different contexts, in Entity Framework. The first thing we should remember is that it is not possible in Entity Framework to join two or more entities of different contexts directly.