Woocommerce Select Orders which match multiple meta values - php

Question

I'm currently working on a plugin which was built for a bakery to email reports about orders. They have since opened another store and now the reports need to be split into separate emails depending on store location.
I have the following sql query:
$sql = "SELECT o.order_item_id, o.order_item_name, o.order_id, po.post_date AS order_date_placed
FROM wp_woocommerce_order_items AS o
LEFT JOIN wp_woocommerce_order_itemmeta AS oi ON o.order_item_id = oi.order_item_id
LEFT JOIN wp_posts AS po ON po.ID = o.order_id
WHERE oi.meta_key='Collection Date'
AND oi.meta_value IN ('16/01/2016','17/01/2016','18/01/2016','19/01/2016','20/01/2016','21/01/2016')
ORDER BY po.post_date ASC, o.order_item_id ASC";
This query returns all orders which are to be collected within a specific date range.
array (size=3)
0 =>
object(stdClass)[593]
public 'order_item_id' => string '19582' (length=5)
public 'order_item_name' => string '10 Chocolate Cupcakes' (length=21)
public 'order_id' => string '15234' (length=5)
public 'order_date_placed' => string '2016-01-14 08:51:31' (length=19)
1 =>
object(stdClass)[592]
public 'order_item_id' => string '19600' (length=5)
public 'order_item_name' => string '10 Chocolate Cupcakes' (length=21)
public 'order_id' => string '15248' (length=5)
public 'order_date_placed' => string '2016-01-14 15:43:08' (length=19)
2 =>
object(stdClass)[591]
public 'order_item_id' => string '19603' (length=5)
public 'order_item_name' => string '10 Chocolate Cupcakes' (length=21)
public 'order_id' => string '15250' (length=5)
public 'order_date_placed' => string '2016-01-14 15:45:25' (length=19)
I now want to pass an additional criteria that will also limit the return data to a specific store location.
I have tried adding the following to the query but this returns null.
WHERE oi.meta_key = 'Pickup Location'
AND oi.meta_value LIKE '%Address 1%'
Only records which are true for both criteria must return.
I do battle to understand why the meta table in wordpress/woocommerce are set up the way they are with so many redundant/duplicate entries.
I'm not sure whether the developer should have used a raw SQL query or whether there is a better solution for this problem.
Any help is much appreciated.

Answer 1

I guess you are looking for this query
SELECT o.order_item_id,
o.order_item_name,
o.order_id,
po.post_date AS order_date_placed
FROM wp_woocommerce_order_items AS o
LEFT JOIN wp_woocommerce_order_itemmeta AS oi
ON ( o.order_item_id = oi.order_item_id
AND oi.meta_key = 'Collection Date'
AND oi.meta_value IN ( '16/01/2016', '17/01/2016','18/01/2016',
'19/01/2016','20/01/2016', '21/01/2016' ) )
OR ( oi.meta_key = 'Pickup Location'
AND oi.meta_value LIKE '%Address 1%' )
LEFT JOIN wp_posts AS po
ON po.id = o.order_id
ORDER BY po.post_date ASC,
o.order_item_id ASC
And move the filter to ON conditions since those belongs to right table