MariaDB select 不等于

Question

当然这会在几秒钟内被标记为欺骗，但我终究无法弄清楚这个查询有什么问题：

MariaDB [nextcloud]> describe oc_file_locks;
+-------+---------------------+------+-----+---------+----------------+
| Field | Type                | Null | Key | Default | Extra          |
+-------+---------------------+------+-----+---------+----------------+
| id    | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| lock  | int(11)             | NO   |     | 0       |                |
| key   | varchar(64)         | NO   | UNI | NULL    |                |
| ttl   | int(11)             | NO   | MUL | -1      |                |
+-------+---------------------+------+-----+---------+----------------+
4 rows in set (0.003 sec)

MariaDB [nextcloud]> select * from oc_file_locks where lock <> 0;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'lock <> 0' at line 1
MariaDB [nextcloud]> select * from oc_file_locks where lock != 0;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'lock != 0' at line 1

我是不是疯了，或者这行得通吗？我的 SQL 有点生疏了，但我不认为它有那么糟糕。

Answer 1

key 和 lock 是 reserved words。选择不同的名称，或将它们括在反引号中：

select * from oc_file_locks where `lock` <> 0;

MariaDB select 不等于

MariaDB select where not equal

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