sqlcmd -S localhost -U sa -P '<123123Aa!@>'

CREATE DATABASE MyDb;
go

USE MyDb;
go
CREATE TABLE t_class (id INT PRIMARY KEY, name VARCHAR(22));
go
CREATE TABLE t_student (id INT PRIMARY KEY, name VARCHAR(22), classId INT ,CONSTRAINT fk_stu_class1  FOREIGN KEY (classId) REFERENCES t_class(id));
go