Left Join

--20cf3071c91ca2414f04a9efb017
Content-Type: text/plain; charset=ISO-8859-1

I am tyring to build a query that will take the most recent
"stores.store_date" column then join it with "store_list.store_name" where
store_list.store_name and
stores.store_subject match then return the most recent "stores.store_date".
I am guessing this will require some sort of join. I have been tyring to
figure it
out but have had no luck.
Any help is greatly apprciated.
Thank you.

mysql> select * from stores;
+----------+-----------------+------------+----------------- ----+-----------+----------+-----------------+--------------
-----------+
| store_id | store_subject | store_type | store_date | store_mar
| store_by | store_tptest | store_comment
s |
+----------+-----------------+------------+----------------- ----+-----------+----------+-----------------+--------------
-----------+
| 78 | Bella Roe | corporate | 2011-06-28 15:01:02 | 0
| 1 | |
|
| 79 | Bella | corporate | 2011-08-06 08:48:26 | 0
| 1 | 600kbps-3.8mbps | test
|
| 80 | Brittney~2120 | corporate | 2011-08-06 08:48:50 | 1
| 1 | 600kbps-3.8mbps | should post t
o Wichita! |
| 81 | Motor | premier | 2011-08-06 14:52:55 | 1
| 1 | 600kbps-3.8mbps | test
|
| 82 | Liberty | corporate | 2011-08-06 14:54:41 | 0
| 1 | 0-250kbps | test
|
| 83 | Seneca~3165 | corporate | 2011-08-06 14:58:47 | 0
| 1 | 600kbps-3.8mbps | test
|
| 84 | Liberty | corporate | 2011-08-06 14:59:32 | 0
| 1 | 400-600kbps | test
|
| 85 | Brittney~2120 | corporate | 2011-08-06 15:00:43 | 0
| 1 | 600kbps-3.8mbps | test
|
| 86 | Liberty | corporate | 2011-08-06 15:01:11 | 0
| 1 | 300-400kbps | test
|
| 87 | Brittney~2120 | corporate | 2011-08-06 15:11:06 | 0
| 1 | 250-300kbps | test
|
| 88 | Brittney~2120 | corporate | 2011-08-06 15:23:53 | 1
| 1 | 600kbps-3.8mbps | test
|
| 89 | Bella | corporate | 2011-08-06 15:31:49 | 0
| 1 | 600kbps-3.8mbps | test
|
| 90 | Cleartalk~10221 | premier | 2011-08-06 15:32:54 | 0
| 1 | 250-300kbps | test
|
| 91 | Chit | premier | 2011-08-06 15:33:50 | 1
| 1 | 250-300kbps | test
|
| 92 | | | 2011-08-06 15:34:21 | 2
| 1 | 300-400kbps | test
|
| 93 | Bella | corporate | 2011-08-07 11:26:13 | 0
| 1 | 600kbps-3.8mbps | test
|
+----------+-----------------+------------+----------------- ----+-----------+----------+-----------------+--------------
-----------+
16 rows in set (0.00 sec)
mysql>

mysql> select * from store_list LIMIT 15;'
+----+---------------+-------------------------------------- --+------------+-------------+-----------+
| id | market_prefix | store_name | store_type |
market_name | id_market |
+----+---------------+-------------------------------------- --+------------+-------------+-----------+
| 1 | MCI | Bella Roe~4980 Roe Blvd | Corporate |
Kansas City | 0 |
| 2 | MCI | Cleartalk~4635 Shawnee Dr | Premier |
Kansas City | 0 |
| 3 | MCI | Cleartalk~3612 State Avenue | Premier |
Kansas City | 0 |
| 4 | MCI | Endless Wireless~1620 Central Avenue | Premier |
Kansas City | 0 |
| 5 | MCI | Get Wireless~840 Minnesota | Premier |
Kansas City | 0 |
| 6 | MCI | Ring Ring Wireless~7559 State Avenue | Premier |
Kansas City | 0 |
| 7 | MCI | Cleartalk~1212 Sante Fe | Premier |
Kansas City | 0 |
| 8 | MCI | Cleartalk~10221 W 75th Street | Premier |
Kansas City | 0 |
| 9 | MCI | Free Talk~10830 Shawnee Mission Pkwy | Premier |
Kansas City | 0 |
| 10 | MCI | Loma Vista~8712 Blue Ridge Blvd | Corporate |
Kansas City | 0 |
| 11 | MCI | Ring Ring Wireless~25 W. 39th Street | Premier |
Kansas City | 0 |
| 12 | MCI | Ring Ring Wireless~3039 Prospect Ave | Premier |
Kansas City | 0 |
| 13 | MCI | Ring Ring Wireless~1201 E Linwood Blvd | Premier |
Kansas City | 0 |
| 14 | MCI | Ring Ring Wireless~4314 Rainbow Blvd | Premier |
Kansas City | 0 |
| 15 | MCI | Ring Ring Wireless~7445 Prospect Ave. | Premier |
Kansas City | 0 |
+----+---------------+-------------------------------------- --+------------+-------------+-----------+
15 rows in set (0.00 sec)

--20cf3071c91ca2414f04a9efb017--

Re: Left Join

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Re: Left Join

--20cf307d05feee764904a9f03bdf
Content-Type: text/plain; charset=ISO-8859-1

>On Sun, Aug 7, 2011 at 3:00 PM, Peter Lind wrote:

> >Maybe it's just me, but I can't see anything that would work as

>foreign key for you to join on - neither table seems to have a foreign
> >key
>

Sorry for my ignorance. How do I create the foreign key? The two columns
from each table that have a similar relationship are stores.store_mar and
store_list.id_market. Once the foreign key is build what would be the
correct syntax to achieve my query?

Thank you very much,

Chris

>
>
>

--20cf307d05feee764904a9f03bdf--

RE: Left Join

Is the design under your control? If so, you need to change it. Your
store_list.store_name field breaks the first rule of relational databases -
it isn't atomic. That means that you have two pieces of information there -
the store name and store address. You even have a '~' there to separate them
(nice try, but no).

It's not clear what the function of the 'stores' table is, but there's a
nasty smell coming from there as well (and a field with tilde-separated data
too!)

If this *is* your design, then you might want to show what the source data
looks like. If it's not your design, you have my permission to tell the
owner off ;-)

Not that this really has anything to do with PHP, but I won't say anything
if you won't.

Toby


-----Original Message-----
From: Chris Stinemetz [mailto:chrisstinemetz@gmail.com]
Sent: Sunday, August 07, 2011 9:33 PM
To: Peter Lind
Cc: php-db@lists.php.net
Subject: Re: [PHP-DB] Left Join

>On Sun, Aug 7, 2011 at 3:00 PM, Peter Lind wrote:

> >Maybe it's just me, but I can't see anything that would work as

>foreign key for you to join on - neither table seems to have a foreign
> >key
>

Sorry for my ignorance. How do I create the foreign key? The two columns
from each table that have a similar relationship are stores.store_mar and
store_list.id_market. Once the foreign key is build what would be the
correct syntax to achieve my query?

Thank you very much,

Chris

>
>
>


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