oracle创建表，设置主外键约束以及插入多条语句

-- 创建部门表
CREATE TABLE departments (
  department_id NUMBER(4) CONSTRAINT dept_id_pk PRIMARY KEY,
  department_name VARCHAR2(30) CONSTRAINT dept_name_nn NOT NULL,
  manager_id NUMBER(6),
  location_id NUMBER(4)
);
 
-- 创建员工表，并设置外键约束指向部门表
CREATE TABLE employees (
  employee_id NUMBER(6) CONSTRAINT emp_id_pk PRIMARY KEY,
  employee_name VARCHAR2(30) CONSTRAINT emp_name_nn NOT NULL,
  department_id NUMBER(4) CONSTRAINT emp_dept_id_fk REFERENCES departments(department_id),
  job_id VARCHAR2(10),
  salary NUMBER(8,2)
);
 
-- 插入多条部门数据
INSERT INTO departments (department_id, department_name, manager_id, location_id) VALUES (10, 'IT', 100, 1700);
INSERT INTO departments (department_id, department_name, manager_id, location_id) VALUES (20, 'HR', 200, 1800);
INSERT INTO departments (department_id, department_name, manager_id, location_id) VALUES (30, 'Sales', 300, 1900);
 
-- 插入多条员工数据，同时使用部门ID作为外键
INSERT INTO employees (employee_id, employee_name, department_id, job_id, salary) VALUES (100, 'John Doe', 10, 'IT_PROG', 80000);
INSERT INTO employees (employee_id, employee_name, department_id, job_id, salary) VALUES (200, 'Jane Smith', 20, 'HR_REP', 70000);

在这个例子中，我们首先创建了部门表departments，并在其上定义了主键约束。接着我们创建了员工表employees，并定义了一个外键约束emp_dept_id_fk，该外键关联到部门表的department_id字段。然后我们插入了三条部门数据，以及两条员工数据，并使用了部门ID作为外键值。这个例子展示了如何在Oracle数据库中创建表、设置主键和外键约束，以及如何插入多条数据记录。