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I am trying to get a primary key from a coupon table to put it in my target table as a foreign key. In between I would like to run a query to get the last insert id. I can't get the syntax right though

$couponId = $wpdb->query("select last_insert_id() from frequentVisitorCoupons_coupons");
  var_dump($couponId); // false
$couponId = $wpdb->query("select * from frequentVisitorCoupons_coupons where last_insert_id()");
  var_dump($couponId); // false

What is the correct syntax for this query?

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You can get the last inserted ID from $wpdb with the insert_id property:

$wpdb->insert( ... );
$couponId = $wpdb->insert_id

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