Knowledgebase
Selecting data from two different tables in phpmyadmin
| Posted by globalcashsite, 06-29-2009, 05:37 AM | | Guys
I have two tables,
A = Client table (client_id, client_name fields)
B = History table (amount field)
I want to select all clients from Client tables who have any record/amount in History Table.
Please let me know how to do this?
Thank you
GCS
|
| Posted by 01globalnet, 06-29-2009, 07:22 AM | | You should have an associated key for both tables. A: client_id, B:client_id
|
| Posted by mioot, 06-29-2009, 07:44 AM | | run this query in phpmyadmin
SELECT client.name,history.amount FROM HISTORY LEFT JOIN client ON client
.client_id = history.client_id
|
| Posted by jstanden, 06-29-2009, 01:47 PM | | If there's always going to be a foreign key on 'client_id' between the tables you should use an INNER JOIN rather than a LEFT JOIN. The latter will also include rows which don't exist in both tables (a client without history rows, or orphaned history rows with no client).
http://en.wikipedia.org/wiki/Referential_integrity
|
| Posted by HivelocityDD, 06-30-2009, 10:02 AM | | It is always better to use a foreign key in table B if you dont have one there. Also use inner join ie (where a.id=b.fid) instead of left join to avoid unnecessary records.
You can run the sql query in phpmyadmin using the editSQL option
|
|
 Add to Favourites
 Print this Article
|
Also Read
