### Database Schema:
CREATE TABLE taughtBy (
	course_id	INTEGER	NULL	PRIMARY KEY,
	p_id	INTEGER	NULL	PRIMARY KEY,
	foreign key (course_id) references course (course_id),
	foreign key (p_id) references person (p_id)
);

CREATE TABLE course (
	course_id	INTEGER	NULL	PRIMARY KEY,
	courseLevel	TEXT	NULL
);

CREATE TABLE person (
	p_id	INTEGER	NULL	PRIMARY KEY,
	professor	INTEGER	NULL,
	student	INTEGER	NULL,
	hasPosition	TEXT	NULL,
	inPhase	TEXT	NULL,
	yearsInProgram	TEXT	NULL
);

CREATE TABLE advisedBy (
	p_id	INTEGER	NULL	PRIMARY KEY,
	p_id_dummy	INTEGER	NULL	PRIMARY KEY,
	foreign key (p_id) references person (p_id),
	foreign key (p_id_dummy) references person (p_id)
);

### User's Query:
How many basic or medium undergraduate courses are taught by a professor?

### Extra Knowledge:
basic or medium undergraduate courses refers to courseLevel = 'Level_300'; professor refers to professor = 1
SELECT COUNT(*) FROM course AS T1 INNER JOIN taughtBy AS T2 ON T1.course_id = T2.course_id INNER JOIN person AS T3 ON T3.p_id = T2.p_id WHERE T1.courseLevel = 'Level_300' AND T3.professor = 1