Wordpress Query Format

I have a wordpress website and have a hard time remembering how to format a query.
The following Query is close but not correct:

$pdf_c = $pdo->prepare("SELECT meta_value
					FROM wp_woocommerce_order_itemmeta
					WHERE (meta_key='_subscription_start_date' AND order_item_id = :id) AS start
					WHERE (meta_key='_subscription_expiry_date' AND order_item_id = :id) AS ending");

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I want to select the value of BOTH _subscription_start_date AND _subscription_expiry_date
LVL 7
rgranlundAsked:
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Julian HansenCommented:
Looks like you are trying to get the values out in one row - when they are in fact different rows.

You can't have AS in a WHERE clause - the AS is applied to field and table names in the SELECT part of the statement, the WHERE clause is for filtering results based on certain criteria.

i.e.
SELECT field as 'Fieldname' FROM table as t1;

It sounds like the two values you want are in different records which means you have to retrieve them as a JOIN or individually.

As a join you could try something like this
$pdf_c = $pdo->prepare("SELECT a.meta_value AS start, b.meta_value AS ending 
	FROM wp_woocommerce_order_itemmeta AS a LEFT JOIN wp_woocommerce_order_itemmeta AS b ON a.order_item_id = b.order_item_id
	WHERE a.order_item_id = :id AND a.meta_key='_subscription_start_date' AND b.meta_key='_subscription_expiry_date'");

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The above query joins the wp_woocommerce_order_itemmeta table to itself on the order_id and then from that JOIN selects the row that has the _subscription_start_date and _subscription_expiry_Date meta_key values.
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rgranlundAuthor Commented:
I get the following error using your script format:
Array ( [0] => 42000 [1] => 1064 [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'wp_woocommerce_order_itemmeta AS c ON a.order_item_id = c.order_item_id ' at line 4 ) 1

What do you think the issue is with my code?
	$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
										FROM wp_woocommerce_order_itemmeta AS a LEFT JOIN
										wp_woocommerce_order_itemmeta AS b ON a.order_item_id = b.order_item_id
										wp_woocommerce_order_itemmeta AS c ON a.order_item_id = c.order_item_id
										wp_woocommerce_order_itemmeta AS d ON a.order_item_id = d.order_item_id
										wp_woocommerce_order_itemmeta AS e ON a.order_item_id = e.order_item_id
										WHERE a.order_item_id = :id
										AND a.meta_key='_subscription_start_date'
										AND b.meta_key='_subscription_expiry_date'
										AND c.meta_key='_subscription_end_date'
										AND d.meta_key='_subscription_status'
										AND e.meta_key='_line_total'");
					
				try {
					$pdf_a->execute(array(':id' => $id)) or die(print_r($pdf_a -> errorInfo()));

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0
Julian HansenCommented:
Are you getting an error or wrong results?

The query looks like a brute force transpose - is that what you are trying to achieve?
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rgranlundAuthor Commented:
I'm getting the following error:
Array ( [0] => 42000 [1] => 1064 [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'wp_woocommerce_order_itemmeta AS c ON a.order_item_id = c.order_item_id ' at line 4 ) 1
I need to run a query and get certain meta_values from specific meta_keys.
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Julian HansenCommented:
You left a few LEFT JOIN's out. Try this
$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
  FROM wp_woocommerce_order_itemmeta AS a 
    LEFT JOIN wp_woocommerce_order_itemmeta AS b ON a.order_item_id = b.order_item_id
    LEFT JOIN wp_woocommerce_order_itemmeta AS c ON a.order_item_id = c.order_item_id
    LEFT JOIN wp_woocommerce_order_itemmeta AS d ON a.order_item_id = d.order_item_id
    LEFT JOIN wp_woocommerce_order_itemmeta AS e ON a.order_item_id = e.order_item_id
  WHERE a.order_item_id = :id
    AND a.meta_key='_subscription_start_date'
    AND b.meta_key='_subscription_expiry_date'
    AND c.meta_key='_subscription_end_date'
    AND d.meta_key='_subscription_status'
    AND e.meta_key='_line_total'");

try {
  $pdf_a->execute(array(':id' => $id)) or die(print_r($pdf_a -> errorInfo()));

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0

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