Re: Select from multiple tables

Try DISTINCT On Feb 29, 2012, at 10:28 PM, Amit Tandon wrote:

Dear Kranthi You have to be clear what you decide especially when you are getting multiple rows. To get just a single row you can use LIMIT clause. But it would return only one row. Now you have to decide which row. So i think you decide on what you require and see how can you uniquely identify that row ============ regds amit "The difference between fiction and reality? Fiction has to make sense." On Thu, Mar 1, 2012 at 9:45 AM, Kranthi Krishna <kranthi117@gmail.com>wrote:

Hi, The examples I saw were regarding cartesian join not inner join. I will read about inner joins. Also, the example i mentioned seems to be a mistake. Both school and type will not be similar at the same time Kranthi. http://goo.gl/e6t3 On 1 March 2012 09:26, Kranthi Krishna <kranthi117@gmail.com> wrote:

Hi, Thanks for the input. I have seen some tutorials on joins, they all suggest that MySql returns multiple rows For example -------------------------- School | Board 1 -------------------------- School | Board 1 ------------------------- Now if I have another one-to-many relation ----------------------------------- School | Board 1 | Type 1 ----------------------------------- School | Board 1 | Type 2 ----------------------------------- School | Board 2 | Type 1 ----------------------------------- School | Board 2 | Type 2 ------------------------------------ Using UNIQUE or something similar (like php.net/array_search ) causes problems when Type 1 = Type 2 etc. Kranthi. http://goo.gl/e6t3 On 29 February 2012 19:43, Michael Stowe <mikegstowe@gmail.com> wrote:

Select table1.item1, table2.item1 from table1 inner join table2 on

table1.key = table2.foreignKey Where...

You can also utilize left and right join to get data if there isn't a

direct match (ie customer may not have ordered anything so you want to do a left join on orders as there may not be any order data but you still want to get the customer info).

Hope that helps, Mike Sent from my iPhone On Feb 29, 2012, at 8:01 AM, Kranthi Krishna <kranthi117@gmail.com>

wrote:

Hi all, Say I have an object like array schoolName => string board => array

       string
       string

I generally create two MySql tables schools: id PRIMARY KEY, SchoolName boards: id FOREGIN KEY refers Table A(id), board and then do two selects. The problem is that, the number of selects increase as the number of one-to-many relationships increase. Is there a better way to do this ? I have to extend an existing code so I cannot use any libraries like doctrine Kranthi. http://goo.gl/e6t3 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php

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