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LamNguyen Submit assignment of week 1 #22

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20 changes: 20 additions & 0 deletions sol-1.sql
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'''
Bai 1
'''
select stock_name, sum(
case
when operation = 'buy' then -price
when operation = 'sell' then price
end
) as capital_gain_loss
from Stocks
group by stock_name

'''
Bai 2
'''
SELECT 'Low Salary' AS category , COUNT(*) AS accounts_count FROM accounts WHERE income<20000
UNION
SELECT 'Average Salary' AS category , COUNT(*) AS accounts_count FROM accounts WHERE income BETWEEN 20000 and 50000
UNION
SELECT 'High Salary' AS category , COUNT(*) AS accounts_count FROM accounts WHERE income>50000 ;
50 changes: 50 additions & 0 deletions sol-2.sql
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create table PROFESSOR (
PROF_ID int primary key,
PROF_LNAME varchar(50),
PROF_FNAME varchar(50)
)

create table STUDENT (
STUD_ID int primary key,
STUD_LNAME varchar(50),
STUD_FNAME varchar(50),
STUD_STREET varchar(255),
STUD_CITY varchar(50),
STUD_ZIP varchar(10)
)

create table CLASS (
CLASS_ID int primary key,
CLASS_NAME varchar(255),,
PROF_ID int,
COURSE_ID int,
ROOM_ID int,
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 int,
CLASS_ID int,
GRADE varchar(3),
foreign key (STUD_ID) references STUDENT(STUD_ID),
foreign key (CLASS_ID) references CLASS(CLASS_ID),
PRIMARY KEY (STUD_ID, CLASS_ID)
)


create table COURSE (
COURSE_ID int primary key,
COURSE_NAME varchar(255)
)

create table ROOM (
ROOM_ID int primary key,
ROOM_LOC varchar(50),
ROOM_CAP varchar(50),
CLASS_ID int
)

ALTER TABLE ROOM
ADD CONSTRAINT FK_ROOM_CLASS FOREIGN KEY (CLASS_ID) REFERENCES CLASS(CLASS_ID)
185 changes: 185 additions & 0 deletions sol-3.sql
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'''
Hãy viết câu query để tìm:
những cặp student-professor có dạy học nhau và số lớp mà họ có liên quan
những course (distinct) mà 1 professor cụ thể đang dạy
những course (distinct) mà 1 student cụ thể đang học
điểm số là A, B, C, D, E, F tương đương với 10, 8, 6, 4, 2, 0
điểm số trung bình của 1 học sinh cụ thể (quy ra lại theo chữ cái, và xếp loại học lực (weak nếu avg < 5, average nếu >=5 < 8, good nếu >=8 )
điểm số trung bình của các class (quy ra lại theo chữ cái)
điểm số trung bình của các course (quy ra lại theo chữ cái)
'''

--những cặp student-professor có dạy học nhau và số lớp mà họ có liên quan
select pr.PROF_ID, st.STUD_ID, cl.CLASS_ID
from PROFESSOR pr inner join CLASS cl on pr.PROF_ID = cl.PROF_ID
inner join ENROLL en on cl.CLASS_ID = en.CLASS_ID
inner join STUDENT st on en.STUD_ID = st.STUD_ID

--những course (distinct) mà 1 professor cụ thể đang dạy. VD professor có id = 1
select distinct co.COURSE_NAME
from PROFESSOR pr inner join CLASS cl on pr.PROF_ID = cl.PROF_ID
inner join COURSE co on cl.COURSE_ID = co.COURSE_ID
where pr.PROF_ID = 1

--những course (distinct) mà 1 student cụ thể đang học. VD student có id = 1
select distinct co.COURSE_NAME
from STUDENT st inner join ENROLL en on st.STUD_ID = en.STUD_ID
inner join CLASS cl on en.CLASS_ID = cl.CLASS_ID
inner join COURSE co on cl.COURSE_ID = co.COURSE_ID
where st.STUD_ID = 1

--điểm số là A, B, C, D, E, F tương đương với 10, 8, 6, 4, 2, 0
select (
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) as GRADE
from STUDENT st inner join ENROLL en on st.STUD_ID = en.STUD_ID

--điểm số trung bình của 1 học sinh cụ thể (quy ra lại theo chữ cái, và xếp loại học lực (weak nếu avg < 5, average nếu >=5 < 8, good nếu >=8 )
select (
case
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) < 5 then 'weak'
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) >= 5 and avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) < 8 then 'average'
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) >= 8 then 'good'
end
) as GRADE
from STUDENT st inner join ENROLL en on st.STUD_ID = en.STUD_ID
group by st.STUD_ID

--điểm số trung bình của các class (quy ra lại theo chữ cái)
select cl.CLASS_ID, (
case
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) < 5 then 'weak'
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) >= 5 and avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) < 8 then 'average'
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) >= 8 then 'good'
end
) as GRADE
from CLASS cl inner join ENROLL en on cl.CLASS_ID = en.CLASS_ID
group by cl.CLASS_ID

--điểm số trung bình của các course (quy ra lại theo chữ cái)

select co.COURSE_NAME, (
case
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) < 5 then 'weak'
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) >= 5 and avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) < 8 then 'average'
when avg(
case
when GRADE = 'A' then 10
when GRADE = 'B' then 8
when GRADE = 'C' then 6
when GRADE = 'D' then 4
when GRADE = 'E' then 2
when GRADE = 'F' then 0
end
) >= 8 then 'good'
end
) as GRADE
from COURSE co inner join CLASS cl on co.COURSE_ID = cl.COURSE_ID
inner join ENROLL en on cl.CLASS_ID = en.CLASS_ID
group by co.COURSE_ID