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the previous query is only to filter the meta_key values.
SELECT * FROM `wp_postmeta` WHERE `meta_key` LIKE 'qty' AND `meta_value` LIKE '0'
INSERT INTO `wp_postmeta` WHERE `meta_key` LIKE 'qty' AND `meta_value` LIKE '0'(`meta_key`, `meta_value`) VALUES ([_wplp_post_front],)