oracle primary key

Oracle主键是一种用于确定表中每一行的唯一标识符的约束。这个约束保证表中每个记录都有一个唯一的标识符，它既可以用于查找、更新和删除指定行，也可以作为在表之间建立关系的依据。为了定义主键，必须指定一个或多个列，这些列的值被用来唯一标识每一行。该约束还确保了所定义的列值不允许为空。Oracle数据库允许在主键中使用多个列，这在复合主键的情况下非常有用。

相关问题

oracle constraint primary key

Oracle约束主键是一种用于保证表中每行数据唯一性的约束。它要求表中的某一列或多列的值不能重复，并且该列或多列必须包含非空值。主键约束可以通过CREATE TABLE语句或ALTER TABLE语句来定义。在表中定义主键约束后，系统会自动创建一个索引来加速主键的查找和排序。主键约束是数据库设计中非常重要的一部分，它可以保证数据的完整性和一致性。

根据这些信息提供创建数据库和创建数据表的Oracle代码：CUSTOMER: stores customer information such as name, address, phone number, email, and loyalty program status. This table has the primary key of CustomerID. • ORDER: stores information about each order such as the order date, order status, and total cost. This table has a primary key of OrderID and a foreign key to the Customer table. • ORDER_DETAILS: stores details about each item in an order such as the product name, price, quantity, and subtotal. This table has a primary key of OrderDetailID and foreign keys to the Order and PRODUCT tables. • PRODUCT: stores information about each product such as the product name, description, price, and category. This table has the primary key of ProductID. • STORE: stores information about each store such as the store name, location, and hours of operation. This table has the primary key of StoreID. • INVENTORY: stores information about the inventory for each product in each store such as the quantity on hand and the reorder point. This table has a composite primary key of ProductID and StoreID. Group Assignment • TRANSACTION: stores information about each transaction such as the transaction date, transaction type, and total amount. This table has a primary key of TransactionID and a foreign key to the Customer table. • TRANSACTION_DETAILS: stores details about each item in a transaction such as the product name, price, quantity, and subtotal. This table has the primary key of TransactionDetailID and foreign keys to the TRANSACTION and PRODUCT tables. • EMPLOYEE: stores employee information such as name, address, phone number, email, and position. This table has the primary key of EmployeeID. • SALARY: stores information about the salary for each employee such as the salary amount, start date, and end date. This table has a composite primary key of EmployeeID and StartDate. • SHIFT: stores information about the shift for each employee such as the start time, end time, and store location. This table has a primary key of ShiftID and foreign keys to the Employee and STORE tables.

以下是创建数据库和创建数据表的Oracle代码：

创建数据库：

CREATE DATABASE myDatabase;

创建数据表：

CREATE TABLE CUSTOMER (
    CustomerID INT PRIMARY KEY,
    Name VARCHAR(50),
    Address VARCHAR(100),
    Phone VARCHAR(20),
    Email VARCHAR(50),
    LoyaltyProgramStatus VARCHAR(20)
);

CREATE TABLE ORDER (
    OrderID INT PRIMARY KEY,
    OrderDate DATE,
    OrderStatus VARCHAR(20),
    TotalCost DECIMAL(10, 2),
    CustomerID INT FOREIGN KEY REFERENCES CUSTOMER(CustomerID)
);

CREATE TABLE ORDER_DETAILS (
    OrderDetailID INT PRIMARY KEY,
    ProductName VARCHAR(50),
    Price DECIMAL(10, 2),
    Quantity INT,
    Subtotal DECIMAL(10, 2),
    OrderID INT FOREIGN KEY REFERENCES ORDER(OrderID),
    ProductID INT FOREIGN KEY REFERENCES PRODUCT(ProductID)
);

CREATE TABLE PRODUCT (
    ProductID INT PRIMARY KEY,
    ProductName VARCHAR(50),
    Description VARCHAR(100),
    Price DECIMAL(10, 2),
    Category VARCHAR(50)
);

CREATE TABLE STORE (
    StoreID INT PRIMARY KEY,
    StoreName VARCHAR(50),
    Location VARCHAR(100),
    HoursOfOperation VARCHAR(50)
);

CREATE TABLE INVENTORY (
    ProductID INT,
    StoreID INT,
    QuantityOnHand INT,
    ReorderPoint INT,
    PRIMARY KEY (ProductID, StoreID),
    FOREIGN KEY (ProductID) REFERENCES PRODUCT(ProductID),
    FOREIGN KEY (StoreID) REFERENCES STORE(StoreID)
);

CREATE TABLE TRANSACTION (
    TransactionID INT PRIMARY KEY,
    TransactionDate DATE,
    TransactionType VARCHAR(20),
    TotalAmount DECIMAL(10, 2),
    CustomerID INT FOREIGN KEY REFERENCES CUSTOMER(CustomerID)
);

CREATE TABLE TRANSACTION_DETAILS (
    TransactionDetailID INT PRIMARY KEY,
    ProductName VARCHAR(50),
    Price DECIMAL(10, 2),
    Quantity INT,
    Subtotal DECIMAL(10, 2),
    TransactionID INT FOREIGN KEY REFERENCES TRANSACTION(TransactionID),
    ProductID INT FOREIGN KEY REFERENCES PRODUCT(ProductID)
);

CREATE TABLE EMPLOYEE (
    EmployeeID INT PRIMARY KEY,
    Name VARCHAR(50),
    Address VARCHAR(100),
    Phone VARCHAR(20),
    Email VARCHAR(50),
    Position VARCHAR(50)
);

CREATE TABLE SALARY (
    EmployeeID INT,
    StartDate DATE,
    EndDate DATE,
    SalaryAmount DECIMAL(10, 2),
    PRIMARY KEY (EmployeeID, StartDate),
    FOREIGN KEY (EmployeeID) REFERENCES EMPLOYEE(EmployeeID)
);

CREATE TABLE SHIFT (
    ShiftID INT PRIMARY KEY,
    StartTime TIME,
    EndTime TIME,
    StoreID INT FOREIGN KEY REFERENCES STORE(StoreID),
    EmployeeID INT FOREIGN KEY REFERENCES EMPLOYEE(EmployeeID)
);