postgresql - 使用 postgreSQL 创建表

Question

我被要求使用 PostgreSQL 创建一个表并使用以下信息:

The properties table should consist of: property_id (this should be the primary key as well as a unique number that increments automatically) name number of units owner_id (this should have the constraint NOT NULL) There should be also be a foreign key that references the owners table

我写了以下内容

apartmentlab=# CREATE TABLE properties (
apartmentlab(# PRIMARY KEY property_id SERIAL,
apartmentlab(# name TEXT,
apartmentlab(# num_of_units numeric,
apartmentlab(# FOREIGN KEY (owner_id) REFERENCES owners (owner_id) NOT NULL
apartmentlab(# );

---

我收到以下消息:

ERROR: syntax error at or near "property_id" LINE 2: PRIMARY KEY property_id SERIAL,

谁能告诉我 property_id 和我的语法有什么问题。我查看了文档，这看起来是正确的。

Answer 1

PRIMARY KEY 子句位于数据类型之后:

CREATE TABLE properties (
    property_id SERIAL PRIMARY KEY,
    name TEXT,
    num_of_units numeric,
    FOREIGN KEY (owner_id) REFERENCES owners (owner_id) NOT NULL
);

另请注意您在外键定义中的错误。您可能还需要在您的表中定义字段 owner_id，其数据类型与被引用表中的数据类型相同。