我的SQL有问题。 我有一个自定义post_type(client_sales)与几个自定义字段(“销售”,“折扣”等) 我有超过9000个帖子,每天我有超过100个帖子。
所以我想只使用一个SQL查询来跟踪“销售”和“折扣”的总和。
function get_sum_from_custom_fields($posttype , $status, $fields){
global $wpdb;
foreach ($status as $key => $val) {
$status[$key] = "p.post_status = '{$val}'";
}
$status = implode(" OR ", $status);
$fields = is_array($fields) ? $fields : array($fields);
$cols = array();
$inners = array();
foreach ($fields as $field) {
$cols[] = "SUM(c_{$field}.meta_value) AS {$field}";
$inners[] = "INNER JOIN ".$wpdb->postmeta." c_{$field}
ON c_{$field}.post_id=p.ID
AND c_{$field}.meta_key = '$field'";
}
$cols = implode(", ", $cols);
$inners = implode(" ", $inners);
$q ="SELECT
count(p.ID) AS 'count',
$cols
FROM
$wpdb->posts p
$inners
WHERE 1=1
AND p.post_type = '$posttype'
AND ($status)
AND p.post_name NOT LIKE '%revision%'
AND p.post_name NOT LIKE '%autosave%'";
echo "<pre>"; var_dump($q); echo "</pre>";
return $wpdb->get_results($q);
}
所以我们假设你使用这个函数:
$posttype = 'client_sales';
$status = array(
'discount_used',
'in-progress',
'discount_in_coupon'
);
$data1 = get_sum_from_custom_fields($posttype, $status,'sale');
$data2 = get_sum_from_custom_fields($posttype, $status,'discount');
$data3 = get_sum_from_custom_fields($posttype, $status, array ('sale','discount'));
data1和data2是正确的,而data3在“sale”列中返回错误。
示例:
$data1 would be: counts = 5000, c_sale = 2000
$data2 would be: counts = 5000, c_discount = 60
$data3 returns : counts = 5000, c_sale = 1376, c_discount = 60
那么为什么我在data3上的“c_sales”有所不同?从2000年到另一个我不理解的数字是正确的(1376)?
对data3的查询是:
SELECT
count(p.ID) AS 'count_client_sales',
SUM(c_montant_dachats.meta_value) AS montant_dachats, SUM(c_montant_de_remise.meta_value) AS montant_de_remise
FROM
wp_posts p
INNER JOIN wp_postmeta c_montant_dachats
ON c_montant_dachats.post_id=p.ID
AND c_montant_dachats.meta_key = 'montant_dachats' INNER JOIN wp_postmeta c_montant_de_remise
ON c_montant_de_remise.post_id=p.ID
AND c_montant_de_remise.meta_key = 'montant_de_remise'
WHERE 1=1
AND p.post_type = 'client_sales'
AND (p.post_status = 'discount_used' OR p.post_status = 'in-progress' OR p.post_status = 'discount_in_coupon')
AND p.post_name NOT LIKE '%revision%'
AND p.post_name NOT LIKE '%autosave%'
有什么想法吗?
答案 0 :(得分:2)
你非常接近正确的解决方案(这是非常好的,因为wp_postmeta可以正确使用颈部疼痛)。
但是你应该在查询中使用LEFT JOIN而不是INNER JOIN。当您使用INNER JOIN时,如果左侧的表格不匹配,则会从结果集中删除右侧表格中的行。我怀疑你有一些行sale
postmeta而没有discount
postmeta,反之亦然。