对上述创建的每个表随便插入3到5条记录

下面是对每个表插入3到5条记录的示例代码：

-- 插入管理员记录
INSERT INTO Admin (admin_id, work_number, name, gender, age) VALUES
(1, 'A001', '张三', '男', 30),
(2, 'A002', '李四', '女', 35),
(3, 'A003', '王五', '男', 28);

-- 插入员工记录
INSERT INTO Employee (employee_id, work_number, name, gender, age, status, admin_id) VALUES
(1, 'E001', '员工1', '男', 25, '在职', 1),
(2, 'E002', '员工2', '女', 27, '在职', 2),
(3, 'E003', '员工3', '男', 30, '离职', 3);

-- 插入用户记录
INSERT INTO User (user_id, license_plate, contact, entry_time, exit_time, parking_duration) VALUES
(1, '粤A12345', '13312345678', '2021-01-01 08:00:00', '2021-01-01 18:00:00', 10),
(2, '粤B23456', '13887654321', '2021-01-02 09:30:00', '2021-01-02 17:30:00', 8),
(3, '粤C34567', '13998765432', '2021-01-03 10:15:00', '2021-01-03 16:45:00', 6);

-- 插入操作记录
INSERT INTO Operation (operation_id, employee_id, user_id, operation_time) VALUES
(1, 1, 1, '2021-01-01 18:15:00'),
(2, 2, 2, '2021-01-02 17:45:00'),
(3, 3, 3, '2021-01-03 17:00:00');

-- 插入车位信息记录
INSERT INTO ParkingLot (parking_lot_id, availability, unit_price, employee_id) VALUES
(1, '可用', 10.00, 1),
(2, '不可用', 10.00, 2),
(3, '可用', 12.50, 3);

以上代码会向每个表中插入3到5条记录，你可以根据需要进行修改或扩展。