mysql - 模式创建后抛出错误

Question

CREATE TABLE nodes (
    id INTEGER PRIMARY KEY NOT NULL,
    lat REAL,
    lon REAL,
    user TEXT,
    uid INTEGER,
    version INTEGER,
    changeset INTEGER,
    timestamp TEXT
);                       # this worked

CREATE TABLE nodes_tags (
    id INTEGER,
    key TEXT,
    value TEXT,
    type TEXT,
    FOREIGN KEY (id) REFERENCES nodes(id)
);                      # this did not work

CREATE TABLE ways (
    id INTEGER PRIMARY KEY NOT NULL,
    user TEXT,
    uid INTEGER,
    version TEXT,
    changeset INTEGER,
    timestamp TEXT
);                      # this worked

CREATE TABLE ways_tags (
    id INTEGER NOT NULL,
    key TEXT NOT NULL,
    value TEXT NOT NULL,
    type TEXT,
    FOREIGN KEY (id) REFERENCES ways(id)
);                      # this did not work

CREATE TABLE ways_nodes (
    id INTEGER NOT NULL,
    node_id INTEGER NOT NULL,
    position INTEGER NOT NULL,
    FOREIGN KEY (id) REFERENCES ways(id),
    FOREIGN KEY (node_id) REFERENCES nodes(id)
);                      # this did not work

Error Code: 1064. 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 ' value TEXT, type TEXT, FOREIGN KEY (id) REFERENCES nodes(id) )' at line 3

逗号在此位置无效输入

Answer 1

Key 是一个 Reserved Keyword in MySQL .您真的应该避免将其用作表/列名称。考虑将其命名为其他名称；否则你将不得不在它周围使用反引号。

CREATE TABLE nodes_tags (
    id INTEGER,
    `key` TEXT,  -- I'd prefer renaming it. eg: node_key
    value TEXT,
    type TEXT,
    FOREIGN KEY (id) REFERENCES nodes(id)
);

CREATE TABLE ways_tags (
    id INTEGER NOT NULL,
    `key` TEXT NOT NULL,  -- I'd prefer renaming it. eg: ways_tags_key
    value TEXT NOT NULL,
    type TEXT,
    FOREIGN KEY (id) REFERENCES ways(id)
);