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queries.sql
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queries.sql
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# HW2_9630039
# 1:
SELECT *
FROM user
WHERE first_name = 'Reza';
# -----------------------------
# 2:
SELECT *
FROM user
ORDER BY Trophies desc;
# -----------------------------
# 3:
# SELECT *
# FROM quiz
# WHERE UserID in (SELECT T.UserID
# FROM quiz as T,
# quiz as S
# WHERE T.Date = S.Date
# and T.UserID != S.UserID);
SELECT UserID
FROM quiz
WHERE Date = '2020-11-1 10:03:00';
# ------------------------------
# 4:
SELECT *
FROM user
WHERE UserID = some (
SELECT UserID
FROM quiz
WHERE Topic = 'Sport'
);
# SELECT *
# FROM quiz;
#
# SELECT *
# FROM user;
# ------------------------------
# 5:
WITH topic_count (Topic, count_of_topics) as
(SELECT Topic, COUNT(QuizID)
FROM quiz
GROUP BY Topic)
SELECT *
FROM topic_count;
# SELECT *
# FROM quiz;
# ------------------------------
# 6:
# WITH answer_max_count() as
# SELECT max(cnt)
# FROM quizquestion
# Where (SELECT COUNT(Answer) as cnt
# FROM quizquestion
# );
WITH answer_count (Answer, value) as
(SELECT distinct Answer, count(Answer)
FROM question
natural join quizquestion
WHERE Topic = 'Sport'
GROUP BY Answer)
SELECT Answer
FROM answer_count
WHERE value = (
SELECT MAX(value)
FROM answer_count
);
# SELECT * FROM quiz;
# SELECT * FROM quizquestion;
# SELECT * FROM quiz natural join quizquestion;
# SELECT * FROM question natural join quizquestion WHERE Topic = 'Sport';
# SELECT *
# FROM quizquestion;
# SELECT *
# FROM question;
# delete from question;
# SELECT *
# FROM quiz;
# SELECT *
# FROM quiz
# natural join quizquestion;
# -----------------------------------------------
# 7:
WITH right_answer_count (Right_Answer, value) as
(SELECT distinct RightAnswer, count(RightAnswer)
FROM question
GROUP BY RightAnswer)
SELECT Right_Answer
FROM right_answer_count
WHERE value = (
SELECT MAX(value)
FROM right_answer_count
);
# SELECT * FROM question;
# SELECT *
# FROM question
# WHERE RightAnswer = 'C';
# SELECT *
# FROM quizquestion;
# ----------------------------------------------
# 8:
SELECT Topic, COUNT(QID) as value
FROM question
natural join quizquestion
GROUP BY Topic;
# ----------------------------------------------
# 9:
SELECT UserID, COUNT(QuizID) as value
FROM quiz
natural join user
GROUP BY UserID;
# select *
# from quiz natural join user;
# ----------------------------------------------
# 10:
SELECT QuizID, UserID, COUNT(QuizID) as value
FROM (quiz
natural join quizquestion
natural join question)
WHERE quizquestion.Answer = question.RightAnswer
and quiz.Topic = question.Topic
GROUP BY QuizID, UserID
ORDER BY value desc;
# SELECT *
# from (quiz
# natural join quizquestion
# natural join question)
# where quizquestion.Answer = question.RightAnswer
# and quiz.Topic = question.Topic;
# SELECT *
# FROM (quiz
# natural join quizquestion
# natural join question);
#
# SELECT *
# FROM question;
# ------------------------------------------------
# 11:(Emtiaz dehi ?)
SELECT distinct QuizID, Trophies
FROM quiz
join user
join question
WHERE quiz.UserID = user.UserID
and user.First_name = 'Reza'
and user.Last_name = 'Irani';
# and IF(quizquestion.Answer = question.RightAnswer, Trophies = Trophies + 1, Trophies = Trophies);
# ----------------------------------------------
# 12:
# SELECT QuizID, UserID, COUNT(QuizID) as value
# FROM (quiz
# natural join quizquestion
# natural join question)
# WHERE quizquestion.Answer = question.RightAnswer
# and quiz.Topic = question.Topic
# GROUP BY QuizID, UserID;
SELECT QuizID, UserID, COUNT(QuizID) as num_of_right_answers
FROM (quiz
natural join quizquestion
natural join question)
WHERE quizquestion.Answer = question.RightAnswer
and quiz.Topic = question.Topic
GROUP BY QuizID, UserID
ORDER BY num_of_right_answers desc;
select *
from (quiz
natural join quizquestion
natural join question);
select *
from (quiz
natural join quizquestion
natural join question )
where quizquestion.Answer = question.RightAnswer;
# - - - - - - - - - - - query number 12 is too hard !! - -- - - - - -
# -------------------------------------------------
# 13:
select UserID , Trophies
from user
;