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CREATE TABLE Basic_Info ( id NUMBER(10) PRIMARY KEY, name VARCHAR2(50) NOT NULL, age NUMBER(3), gender CHAR(1) CHECK (gender IN ('M', 'F')), birth_date DATE, email VARCHAR2(100), phone VARCHAR2(20) UNIQUE );
CREATE TABLE Orders ( order_id NUMBER(10) PRIMARY KEY, customer_id NUMBER(10) NOT NULL, order_date TIMESTAMP, amount NUMBER(12, 2), status VARCHAR2(20) CHECK (status IN ('PENDING', 'COMPLETED', 'CANCELED')) );
CREATE TABLE Customers ( customer_id NUMBER(10) PRIMARY KEY, name VARCHAR2(50) NOT NULL, address VARCHAR2(200), city VARCHAR2(50), country VARCHAR2(50), zip_code VARCHAR2(10), created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP );
CREATE TABLE Products ( product_id NUMBER(10) PRIMARY KEY, name VARCHAR2(100) NOT NULL, category VARCHAR2(50), price NUMBER(10, 2), stock_quantity NUMBER(5) CHECK (stock_quantity >= 0) );
CREATE TABLE Order_Details ( order_detail_id NUMBER(10) PRIMARY KEY, order_id NUMBER(10) REFERENCES Orders(order_id) ON DELETE CASCADE, product_id NUMBER(10) REFERENCES Products(product_id), quantity NUMBER(5) CHECK (quantity > 0), price NUMBER(10, 2), total_price AS (quantity * price) VIRTUAL );
CREATE TABLE Employees ( employee_id NUMBER(10) PRIMARY KEY, first_name VARCHAR2(50), last_name VARCHAR2(50), hire_date DATE, department_id NUMBER(10), salary NUMBER(10, 2), manager_id NUMBER(10), FOREIGN KEY (manager_id) REFERENCES Employees(employee_id) );
CREATE TABLE Departments ( department_id NUMBER(10) PRIMARY KEY, name VARCHAR2(50) NOT NULL, location VARCHAR2(100), budget NUMBER(12, 2) CHECK (budget > 0) );
CREATE TABLE Inventory ( inventory_id NUMBER(10) PRIMARY KEY, product_id NUMBER(10) REFERENCES Products(product_id), warehouse_id NUMBER(10), stock_level NUMBER(10), last_update TIMESTAMP DEFAULT CURRENT_TIMESTAMP, UNIQUE (product_id, warehouse_id) );
CREATE TABLE Warehouses ( warehouse_id NUMBER(10) PRIMARY KEY, location VARCHAR2(100), capacity NUMBER(10), manager_id NUMBER(10), FOREIGN KEY (manager_id) REFERENCES Employees(employee_id) );
CREATE TABLE Sales_Stats ( sales_id NUMBER(10) PRIMARY KEY, year NUMBER(4) NOT NULL, month NUMBER(2) NOT NULL, month_start_date DATE DEFAULT SYSDATE NOT NULL, product_id NUMBER(10) REFERENCES Products(product_id), total_sales NUMBER(12, 2) ) PARTITION BY RANGE (month_start_date) INTERVAL (NUMTOYMINTERVAL(1, 'MONTH')) ( PARTITION p_initial VALUES LESS THAN (TO_DATE('2023-01-01', 'YYYY-MM-DD')) );
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