From 30375bdbafa4acb32648a9d74920cae0a2d18006 Mon Sep 17 00:00:00 2001
From: ducnd58233 <only4wns@gmail.com>
Date: Sat, 27 May 2023 19:07:25 +0700
Subject: [PATCH] asm1 database

---
 sol-1-1393.sql |   4 ++
 sol-1-1907.sql |   5 +++
 sol-2.sql      | 118 +++++++++++++++++++++++++++++++++++++++++++++++++
 sol-3.sql      |  88 ++++++++++++++++++++++++++++++++++++
 4 files changed, 215 insertions(+)
 create mode 100644 sol-1-1393.sql
 create mode 100644 sol-1-1907.sql
 create mode 100644 sol-2.sql
 create mode 100644 sol-3.sql

diff --git a/sol-1-1393.sql b/sol-1-1393.sql
new file mode 100644
index 0000000..a742215
--- /dev/null
+++ b/sol-1-1393.sql
@@ -0,0 +1,4 @@
+select stock_name, 
+sum(case when operation = 'Buy' then -price else price end) as capital_gain_loss
+from stocks
+group by stock_name;
\ No newline at end of file
diff --git a/sol-1-1907.sql b/sol-1-1907.sql
new file mode 100644
index 0000000..c925fd3
--- /dev/null
+++ b/sol-1-1907.sql
@@ -0,0 +1,5 @@
+select "Low Salary" category, sum(case when income < 20000 then 1 else 0 end) accounts_count from accounts
+union
+select "Average Salary" category, sum(case when income >= 20000 and income <= 50000 then 1 else 0 end) accounts_count from accounts
+union
+select "High Salary" category, sum(case when income > 50000 then 1 else 0 end) accounts_count from accounts
\ No newline at end of file
diff --git a/sol-2.sql b/sol-2.sql
new file mode 100644
index 0000000..093db42
--- /dev/null
+++ b/sol-2.sql
@@ -0,0 +1,118 @@
+-- DROP DATABASE ep_asm1_2;
+
+CREATE DATABASE IF NOT EXISTS ep_asm1_2;
+USE ep_asm1_2;
+
+DROP TABLE IF EXISTS `professors`;
+CREATE TABLE `professors`(
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `fname` VARCHAR(50),
+  `lname` VARCHAR(50),
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+DROP TABLE IF EXISTS `students`;
+CREATE TABLE `students`(
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `fname` VARCHAR(50),
+  `lname` VARCHAR(50),
+  `street` VARCHAR(255),
+  `city` VARCHAR(50),
+  `zip` VARCHAR(10),
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+DROP TABLE IF EXISTS `courses`;
+CREATE TABLE `courses`(
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `name` VARCHAR(255),
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+DROP TABLE IF EXISTS `classes`;
+CREATE TABLE `classes`(
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `name` VARCHAR(255),
+  `prof_id` INT,
+  `course_id` INT,
+  `room_id` INT,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+DROP TABLE IF EXISTS `rooms`;
+CREATE TABLE `rooms`(
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `loc` VARCHAR(50),
+  `cap` VARCHAR(50),
+  `class_id` INT,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB;
+
+DROP TABLE IF EXISTS `enrolls`;
+CREATE TABLE `enrolls`(
+  `stud_id` INT NOT NULL,
+  `class_id` INT NOT NULL,
+  `grade` VARCHAR(3),
+  PRIMARY KEY (`stud_id`, `class_id`)
+) ENGINE=InnoDB;
+
+
+-- Add Foreign Key
+-- Classes 
+ALTER TABLE Classes
+ADD FOREIGN KEY (`prof_id`) REFERENCES Professors(`id`);
+ALTER TABLE Classes
+ADD FOREIGN KEY (`course_id`) REFERENCES Courses(`id`);
+ALTER TABLE Classes
+ADD FOREIGN KEY (`room_id`) REFERENCES Rooms(`id`);
+
+-- Rooms 
+ALTER TABLE Rooms
+ADD FOREIGN KEY (`class_id`) REFERENCES Classes(`id`);
+
+-- Enrols
+ALTER TABLE Enrolls
+ADD FOREIGN KEY (`stud_id`) REFERENCES Students(`id`);
+ALTER TABLE Enrolls
+ADD FOREIGN KEY (`class_id`) REFERENCES Classes(`id`);
+
+-- Insert to Professor
+insert into Professors values (1, 'Albert', 'Einstein');
+insert into Professors values (2, 'Nicolas', 'Tesla');
+insert into Professors values (3, 'Andrew', 'Ng');
+
+-- Insert to Student
+insert into Students values (1, 'A', 'Nguyen', 'ABC 1', 'HCM', '70000');
+insert into Students values (2, 'B', 'Tran', 'DEF 1', 'HCM', '70000');
+insert into Students values (3, 'C', 'Pham', 'HIJ 1', 'HCM', '70000');
+
+-- Insert to Course
+insert into Courses values (1, 'PE');
+insert into Courses values (2, 'Math');
+insert into Courses values (3, 'Physics');
+insert into Courses values (4, 'Henshin');
+
+-- Insert to Class
+insert into Classes values (1, 'PE1', 1, 1, 1);
+insert into Classes values (2, 'MA1', 2, 2, 2);
+insert into Classes values (3, 'PH1', 3, 3, 3);
+insert into Classes values (4, 'HE1', 3, 3, 4);
+insert into Classes values (5, 'HE2', 3, 4, 5);
+
+-- Insert to Room
+insert into Rooms values (1, '001', '10', 1);
+insert into Rooms values (2, '002', '10', 2);
+insert into Rooms values (3, '003', '10', 3);
+insert into Rooms values (4, '004', '10', 4);
+insert into Rooms values (5, '005', '10', 5);
+
+-- Insert to Enroll
+insert into Enrolls values (1, 2, 'C');
+insert into Enrolls values (2, 1, 'F');
+insert into Enrolls values (2, 2, 'A');
+insert into Enrolls values (2, 3, 'D');
+insert into Enrolls values (3, 1, 'B');
+insert into Enrolls values (3, 3, 'E');
+insert into Enrolls values (1, 4, 'A');
+insert into Enrolls values (2, 4, 'B');
+insert into Enrolls values (3, 4, 'C');
diff --git a/sol-3.sql b/sol-3.sql
new file mode 100644
index 0000000..7a170fc
--- /dev/null
+++ b/sol-3.sql
@@ -0,0 +1,88 @@
+-- 1
+select concat(p.fname, ' ', p.lname) as 'Professor Name',
+      concat(s.fname, ' ', s.lname) as 'Student Name',
+      count(c.id) as 'Number of Related Classes'
+from Professors p
+join Classes c on c.prof_id = p.id
+join Enrolls e on e.class_id = c.id
+join Students s on s.id = e.stud_id
+group by p.id, s.id;
+
+-- 2
+select distinct(co.id)
+from Professors p
+join Classes cl on cl.prof_id = p.id
+join Courses co on co.class_id = cl.id
+group by p.id;
+
+-- 3
+select distinct(co.id)
+from Students s
+join Enrolls e on e.stud_id = s.id
+join Classes cl on cl.id = e.class_id
+join Courses co on co.id = cl.course_id
+group by s.id;
+
+-- 4
+create or replace view Grade2Score as
+select stud_id, class_id, 
+(
+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
+  else 0
+end
+) as score
+from Enrolls;
+
+select * from Grade2Score;
+
+-- 5
+select
+avg(score) as avg_score,
+(
+case
+  when avg(score) >= 8 then 'Good'
+  when avg(score) >= 5 then 'Average'
+  else 'Weak'
+end
+) as classification
+from Grade2Score
+where stud_id = 1;
+
+-- 6
+select class_id,
+avg(score) as avg_score,
+(
+case
+  when avg(score) >= 9 then 'A'
+  when avg(score) >= 8 then 'B'
+  when avg(score) >= 6 then 'C'
+  when avg(score) >= 4 then 'D'
+  when avg(score) >= 2 then 'E'
+  else 'F'
+end
+) as classification
+from Grade2Score
+group by class_id;
+
+-- 7
+select co.id,
+avg(gs.score) as avg_score,
+(
+case
+  when avg(gs.score) >= 9 then 'A'
+  when avg(gs.score) >= 8 then 'B'
+  when avg(gs.score) >= 6 then 'C'
+  when avg(gs.score) >= 4 then 'D'
+  when avg(gs.score) >= 2 then 'E'
+  else 'F'
+end
+) as classification
+from Courses co
+join Classes cl on cl.course_id = co.id
+join Grade2Score gs on gs.class_id = cl.id
+group by co.id;
\ No newline at end of file