Sql server 外键约束不存在错误

我一直在我的psql数据库中得到这个错误

bikefacility=# ERROR:  syntax error at or near "c"
bikefacility-# LINE 1: c
bikefacility-#         ^
bikefacility-# bikefacility=# ALTER TABLE bicycle ADD CONSTRAINT fk_maintenance_contact_person FOREIGN KEY (maintenance_contact_person) REFERENCES maintenance(maintenance_contact_person);
ERROR:  syntax error at or near "ERROR"
LINE 1: ERROR:  syntax error at or near "c"
        ^
bikefacility=# ERROR:  column "maintenance_contact_person" referenced in foreign key constraint does not exist
bikefacility-# bikefacility=# ALTER TABLE bicycle ADD CONSTRAINT fk_rental_period FOREIGN KEY (rental_period) REFERENCES rental(rental_period);
ERROR:  syntax error at or near "ERROR"
LINE 1: ERROR:  column "maintenance_contact_person" referenced in fo...
        ^
bikefacility=# ERROR:  column "rental_period" referenced in foreign key constraint does not exist
bikefacility-# bikefacility=# ALTER TABLE bicycle ADD CONSTRAINT fk_terminal_id FOREIGN KEY (terminal_id) REFERENCES terminal(terminal_id);
ERROR:  syntax error at or near "ERROR"
LINE 1: ERROR:  column "rental_period" referenced in foreign key con...
        ^
bikefacility=# ERROR:  column "terminal_id" referenced in foreign key constraint does not exist

这是我的密码。我在代码中创建了与您在这里看到的相同样式的外键

CREATE TABLE member (
  member_id INTEGER PRIMARY KEY,
  member_fname VARCHAR(15) NOT NULL,
  member_lname VARCHAR(15) NOT NULL,
  member_status VARCHAR(15) NOT NULL,
  member_address VARCHAR(10) NOT NULL,
  member_email VARCHAR(30) NOT NULL
);

CREATE TABLE bicycle (
  bicycle_id INTEGER PRIMARY KEY,
  bicycle_brand VARCHAR(25) NOT NULL,
  bicycle_model VARCHAR(25) NOT NULL,
  bicycle_colour VARCHAR(15) NOT NULL,
  bicycle_type VARCHAR(20) NOT NULL,
  bicycle_size VARCHAR(10) NOT NULL,
  bicycle_availability VARCHAR(20) NOT NULL

);

ALTER TABLE bicycle ADD CONSTRAINT fk_bicycle_pickup_date FOREIGN KEY (bicycle_pickup_date) REFERENCES rental(bicycle_pickup_date) >MATCH FULL;
ALTER TABLE bicycle ADD CONSTRAINT fk_maintenance_contact_person FOREIGN KEY (maintenance_contact_person) REFERENCES maintenance(maintenance_contact_person);
ALTER TABLE bicycle ADD CONSTRAINT fk_terminal_id FOREIGN KEY (terminal_id) REFERENCES terminal(terminal_id);
ALTER TABLE bicycle ADD CONSTRAINT fk_rental_period FOREIGN KEY (rental_period) REFERENCES rental(rental_period);

CREATE TABLE sponsor (
  sponsor_id INTEGER PRIMARY KEY,
  sponsor_name VARCHAR(15) NOT NULL,
  sponsor_contact VARCHAR(30) NOT NULL,
  sponsor_period DATE NOT NULL,
  sponsor_address VARCHAR(50) NOT NULL,
  sponsor_fee DECIMAL (6, 2) NOT NULL
);

CREATE TABLE terminal (
  terminal_id INTEGER PRIMARY KEY,
  terminal_address VARCHAR(50) NOT NULL,
  terminal_minstorage VARCHAR(50) NOT NULL,
  terminal_maxstorage VARCHAR(50) NOT NULL
);

CREATE TABLE rental (
  rental_no INTEGER PRIMARY KEY,
  rental_period DATE NOT NULL,
  bicycle_pickup_date DATE NOT NULL
);

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上面说这些列不存在，但我知道它们存在，因为它们就在那里！有人能帮我吗？提前谢谢

外键的语法对于postgresql是不正确的。例如，ALTER TABLE BICKLE ADD CONSTRAINT fk_terminal_id外键terminal_id引用terminal_id；要求自行车中有一个名为terminal_id的字段，因为查询中的前terminal_id引用自行车表，它应该引用terminal表中的terminal_id

下面是外键的简短教程

致以最良好的祝愿，

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比亚尼

你的模式很混乱

没有表维护，但您尝试引用它。 必须先创建外部表（如rental），然后才能对其进行fk引用。 在进行引用的表中必须有命名字段。桌上自行车中没有自行车取车日期、维护联系人、终端id或租赁期字段。 你的fk参考通常听起来很奇怪。你真的希望每辆自行车只能租一次吗？也许你的意思是租赁指一辆自行车？

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此外，您的命名约定是相当多余的。没有必要在每个字段名中重复表名，这只会在代码中增加不必要的混乱。

SQL server或PostgreSQL？