Insert into the Database

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INSERT INTO `flowerhhsa_wpbf4c`.`wp_postmeta` (`meta_id`, `post_id`, `meta_key`, `meta_value`) VALUES ('', '', 'xxxdate20180601', 1000);

Just match the fields. eg: (‘meta_id’,`post_id`) values (‘meta_id’,`post_id`)
In this case the meta_id and post_id are left blank as they get auto set in the database