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WordPress Query Syntax

I have the following the Wordpress Query.  Can anyone explain to me a better way to write it?  If not can you explain what I am doing wrong?

$pdf_a = $pdo->prepare("SELECT a.meta_value AS start, b.meta_value AS ending, c.meta_value AS end_date, d.meta_value AS status, e.meta_value AS total_policy, f.meta_value AS last_name
										FROM 
										wp_woocommerce_order_itemmeta AS a LEFT JOIN
										wp_woocommerce_order_itemmeta AS b LEFT JOIN 
										wp_woocommerce_order_itemmeta AS c LEFT JOIN
										wp_woocommerce_order_itemmeta AS d LEFT JOIN
										wp_woocommerce_order_itemmeta AS e LEFT JOIN
										wp_woocommerce_order_itemmeta AS f
										ON a.order_item_id = b.order_item_id = c.order_item_id = d.order_item_id = e.order_item_id = f.order_item_id
										WHERE a.order_item_id = :id
										OR a.meta_key = '_subscription_start_date'
										OR b.meta_key = '_subscription_expiry_date'
										OR c.meta_key = '_subscription_end_date'
										OR d.meta_key = '_subscription_status'
										OR e.meta_key = '_line_total'
										OR f.meta_key = 'Bicycle Info - Primary Operator Last Name'");
										
									
                                          
					
				try {
					$pdf_a->execute(array(':id' => $id)) or die(print_r($pdf_a -> errorInfo()));
				

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rgranlund
Asked:
rgranlund
1 Solution
 
GaryCommented:
Hard to make sense of what you are trying to do.
What is the point of this
wp_woocommerce_order_itemmeta AS a LEFT JOIN
wp_woocommerce_order_itemmeta AS b LEFT JOIN
wp_woocommerce_order_itemmeta AS c LEFT JOIN
wp_woocommerce_order_itemmeta AS d LEFT JOIN
wp_woocommerce_order_itemmeta AS e LEFT JOIN
wp_woocommerce_order_itemmeta AS f

You join a table once on a common column, not multiple times.
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PortletPaulCommented:
You need to move the filters you have in the where clause to the relevant join conditions.

It should look more like this:
SELECT
      *
FROM wp_woocommerce_order_itemmeta AS a
      LEFT JOIN wp_woocommerce_order_itemmeta b ON a.order_item_id = b.order_item_id
                                               AND b.meta_key = '_subscription_expiry_date'
      LEFT JOIN wp_woocommerce_order_itemmeta c ON a.order_item_id = c.order_item_id
                                               AND c.meta_key = '_subscription_end_date'
      LEFT JOIN wp_woocommerce_order_itemmeta d ON a.order_item_id = d.order_item_id
                                               AND d.meta_key = '_subscription_status'
      LEFT JOIN wp_woocommerce_order_itemmeta e ON a.order_item_id = e.order_item_id
                                               AND e.meta_key = '_line_total'
      LEFT JOIN wp_woocommerce_order_itemmeta f ON a.order_item_id = f.order_item_id
                                               AND f.meta_key = 'Bicycle Info - Primary Operator Last Name'
WHERE a.meta_key = '_subscription_start_date'

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