MYSQL - 如果表为空则插入

Question

如果表为空(0 行)，我想在表中插入一些数据。

我试过这个:

IF NOT EXISTS(SELECT 1 FROM `account_types`)
THEN
       INSERT INTO `account_types` (`type`, `group`) VALUES ('400', 'test');
       INSERT INTO `account_types` (`type`, `group`) VALUES ('401', 'test2');
END IF;

但是我明白了

Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF NOT EXISTS(SELECT 1 FROM account_types) THEN INSERT INTO `account_types' at line 1

我能做什么？我正在使用 MYSQL

Answer 1

INSERT INTO `account_types`(`type`, `group`)
SELECT * FROM
(SELECT '400' `type`, 'test' `group` UNION ALL
 SELECT '401' `type`, 'test2' `group` UNION ALL
 SELECT '402' `type`, 'test3' `group`) A
WHERE NOT EXISTS (SELECT NULL FROM account_types B WHERE A.type=B.type);

演示

http://sqlfiddle.com/#!9/d1e80e/1