diff --git a/sol-02.sql b/sol-02.sql
new file mode 100644
index 0000000..23d4fac
--- /dev/null
+++ b/sol-02.sql
@@ -0,0 +1,52 @@
+CREATE SCHEMA be01_ass1;
+USE be01_ass1;
+CREATE TABLE PROFESSOR(
+	PROF_ID INTEGER PRIMARY KEY,
+    PROF_LNAME VARCHAR(50),
+    PROF_FNAME VARCHAR(50)
+ );
+   CREATE TABLE STUDENT(
+	STUD_ID INTEGER PRIMARY KEY,
+    STUD_FNAME VARCHAR(50),
+    STUD_LNAME VARCHAR(50),
+    STUD_STREET VARCHAR(50),
+    STUD_CITY VARCHAR(50),
+    STUD_ZIP VARCHAR(50)
+ );
+ 
+ CREATE TABLE COURSE(
+	COURSE_ID INTEGER PRIMARY KEY,
+    COURSE_NAME VARCHAR(255)
+ );
+ 
+CREATE TABLE ROOM(
+	ROOM_ID INTEGER PRIMARY KEY,
+    ROOM_LOC VARCHAR(50),
+    ROOM_CAP VARCHAR(50)
+);
+
+CREATE TABLE CLASS(
+	CLASS_ID INTEGER PRIMARY KEY,
+    CLASS_NAME VARCHAR(255),
+	PROF_ID INTEGER,
+    COURSE_ID INTEGER,
+    ROOM_ID INTEGER,
+    FOREIGN KEY (PROF_ID) REFERENCES PROFESSOR(PROF_ID),
+    FOREIGN KEY (COURSE_ID) REFERENCES COURSE(COURSE_ID),
+    FOREIGN KEY (ROOM_ID) REFERENCES ROOM(ROOM_ID)
+);
+CREATE TABLE ENROLL(
+	STUD_ID INTEGER,
+    CLASS_ID INTEGER,
+	FOREIGN KEY (STUD_ID) REFERENCES STUDENT(STUD_ID),
+    FOREIGN KEY (CLASS_ID) REFERENCES CLASS(CLASS_ID),
+    GRADE VARCHAR(3),
+    PRIMARY KEY(STUD_ID, CLASS_ID)
+);
+CREATE TABLE ClassRoom(
+	CLASS_ID INTEGER,
+    ROOM_ID INTEGER,
+    FOREIGN KEY (CLASS_ID) REFERENCES CLASS(CLASS_ID),
+    FOREIGN KEY (ROOM_ID) REFERENCES ROOM(ROOM_ID),
+    PRIMARY KEY (CLASS_ID, ROOM_ID)
+)
\ No newline at end of file
diff --git a/sol-03.sql b/sol-03.sql
new file mode 100644
index 0000000..f207922
--- /dev/null
+++ b/sol-03.sql
@@ -0,0 +1,82 @@
+USE be01_ass1;
+-- bai 1
+SELECT c.CLASS_NAME, concat(s.STUD_LNAME, '  ', s.STUD_FNAME) as STUD_FULLNAME, concat(p.PROF_FNAME, '  ' , p.PROF_LNAME) as PROF_FULLNAME
+FROM enroll as e
+JOIN student as s
+ON e.STUD_ID = s.STUD_ID
+JOIN class as c
+ON c.CLASS_ID = e.CLASS_ID
+JOIN professor p
+ON p.PROF_ID = c.PROF_ID;
+
+-- bai 2
+select distinct CONCAT(p.PROF_FNAME, '  ', p.PROF_LNAME) AS PROF_FULLNAME, COURSE_NAME
+from professor as p
+join class as c on p.PROF_ID= c.PROF_ID
+join course on c.COURSE_ID = course.COURSE_ID
+group by p.PROF_ID, c.COURSE_ID;
+
+-- bai 3
+SELECT distinct concat(s.STUD_FNAME, '  ', s.STUD_LNAME) as fullname, cs.COURSE_NAME
+FROM student as s
+Join enroll as e
+on s.STUD_ID = e.STUD_ID
+join class as c
+on c.CLASS_ID = e.CLASS_ID
+join course as cs
+on cs.COURSE_ID = c.COURSE_ID;
+
+-- bai 4,5
+SELECT *, 
+    CASE
+        WHEN tempTable.AVG_GRADE = 10 THEN 'A'
+        WHEN tempTable.AVG_GRADE >= 9 THEN 'B'
+        WHEN tempTable.AVG_GRADE >= 6 THEN 'C'
+        WHEN tempTable.AVG_GRADE >= 4 THEN 'D'
+        WHEN tempTable.AVG_GRADE >= 2 THEN 'E'
+        ELSE 'F'
+    END as NUMBER_GRADE
+FROM 
+(SELECT e.STUD_ID, concat(s.STUD_FNAME,'  ',s.STUD_LNAME) as FULLNAME, avg(CAST(e.GRADE as DECIMAL)) as AVG_GRADE
+FROM enroll as e
+JOIN student as s
+ON e.STUD_ID = s.STUD_ID
+GROUP BY e.STUD_ID) as tempTable;
+
+-- bai 6
+select *, 
+    CASE
+        WHEN tempTable.avg_grade = 10 THEN 'A'
+        WHEN tempTable.avg_grade >= 9 THEN 'B'
+        WHEN tempTable.avg_grade >= 6 THEN 'C'
+        WHEN tempTable.avg_grade >= 4 THEN 'D'
+        WHEN tempTable.avg_grade >= 2 THEN 'E'
+        ELSE 'F'
+    END as NUMBER_GRADE
+from (
+select c.CLASS_ID, avg(Cast(e.GRADE as DECIMAL)) as avg_grade
+from class as c
+join enroll as e
+on c.CLASS_ID = e.CLASS_ID
+group by c.CLASS_ID) as tempTable
+order by CLASS_ID;
+
+-- bai 7
+select *, 
+    CASE
+        WHEN tempTable.avg_grade = 10 THEN 'A'
+        WHEN tempTable.avg_grade >= 9 THEN 'B'
+        WHEN tempTable.avg_grade >= 6 THEN 'C'
+        WHEN tempTable.avg_grade >= 4 THEN 'D'
+        WHEN tempTable.avg_grade >= 2 THEN 'E'
+        ELSE 'F'
+    END as NUMBER_GRADE
+from (
+select c.COURSE_ID, avg(Cast(e.GRADE as DECIMAL)) as avg_grade
+from class as c
+join enroll as e
+on c.CLASS_ID = e.CLASS_ID
+join course as cs
+on cs.COURSE_ID = c.COURSE_ID
+group by c.COURSE_ID) as tempTable
+order by COURSE_ID;
\ No newline at end of file