T-SQL from後面多表查詢

USE [test]
GO
--建立表
CREATE TABLE MyClass
(
	ClassID VARCHAR(36) PRIMARY KEY,
	ClassName NVARCHAR(200)
)

CREATE TABLE MyStudent
(
	StudentID VARCHAR(36) PRIMARY KEY,
	StudentName NVARCHAR(200),
)
--插入資訊
INSERT INTO MyClass(ClassID,ClassName)VALUES('0AD2A12E-423E-49BF-A265-1A84B21C2401','一班');
INSERT INTO MyClass(ClassID,ClassName)VALUES('0AD2A12E-423E-49BF-A265-1A84B21C2402','二班');
INSERT INTO MyStudent(StudentID,StudentName)VALUES('FDA251AE-2ACE-4449-8FAC-17D769BEF801','張三');
INSERT INTO MyStudent(StudentID,StudentName)VALUES('FDA251AE-2ACE-4449-8FAC-17D769BEF802','李四');
--簡單查詢
SELECT * FROM MyClass
SELECT * FROM MyStudent
--兩張表關鍵查詢
SELECT * FROM MyClass,MyStudent