Delete from table if the id doesn't exists in another table

问题

I want to delete the id's from types that can't be found in types_photos but I don't know how I can accomplish this. id_type in types_photos are the same as id in types. Here's how the table's structure looks like:

CREATE TABLE IF NOT EXISTS `types` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id_user_added` int(11) DEFAULT '0',
  `id_user_edited` int(11) DEFAULT '0',
  `data_name` text NOT NULL,
  `data_name_seo` text NOT NULL,
  `data_type` enum('tag','equipment','search') NOT NULL,
  `datetime_added` datetime NOT NULL,
  `datetime_edited` datetime NOT NULL,
  `ipaddress_added` text NOT NULL,
  `ipaddress_edited` text NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
)

CREATE TABLE IF NOT EXISTS `types_photos` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id_user_added` int(11) DEFAULT '0',
  `id_user_edited` int(11) DEFAULT '0',
  `id_type` int(11) DEFAULT '0',
  `id_photo` int(11) DEFAULT '0',
  `datetime_added` datetime NOT NULL,
  `datetime_edited` datetime NOT NULL,
  `ipaddress_added` text NOT NULL,
  `ipaddress_edited` text NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
)

So, my question is; how can I delete all id's from types that can't be found in types_photos?

回答1:

DELETE FROM types 
WHERE id NOT IN (
  SELECT ID FROM types_photos
)

来源：https://stackoverflow.com/questions/19482572/delete-from-table-if-the-id-doesnt-exists-in-another-table