initial commit

basics.sql

+CREATE DATABASE testdb;
+DROP DATABASE testdb;
+CREATE TABLE student(
+age int,
+subject varchar(255),
+name varchar(255));
+
+select * from testtable;
+DROP TABLE testtable;
+
+CREATE TABLE college_student AS
+SELECT age, subject from student;
+select * from college_student;
+
+ALTER TABLE college_student 
+ADD department varchar(255);
+
+ALTER TABLE college_student
+DROP age;
+
+ALTER TABLE college_student
+MODIFY COLUMN department char(255);
+
+CREATE TABLE teacher (
+name VARCHAR(255) NOT NULL,
+id INT PRIMARY KEY,
+age INT,
+CHECK (age > 18 AND age < 65));
+
+SELECT * FROM teacher;
+
+INSERT INTO teacher
+VALUES ("Qadeer", 1, 80);
+
+CREATE TABLE employee (
+id INT PRIMARY KEY, 
+age INT NOT NULL, 
+salary INT NOT NULL, 
+emp_id INT UNIQUE,
+department VARCHAR(255),
+CONSTRAINT CHK_EMP CHECK (age > 24 AND salary > 1000 AND age < 65)
+);
+
+ALTER TABLE employee
+ADD CHECK (department  = "Physics");
+
+ALTER TABLE employee
+ADD CONSTRAINT CHK_AGE CHECK (age < 80),
+ALTER salary SET DEFAULT 25000;
+
+ALTER TABLE employee
+ALTER salary DROP DEFAULT;
+
+ALTER TABLE employee
+DROP CONSTRAINT employee_chk_1;
+
+SELECT age AS a, 
+salary AS s, 
+department AS d
+FROM employee;
+
+CREATE UNIQUE INDEX name_index
+ON employee (name);
+
+ALTER TABLE employee
+ADD COLUMN name varchar(255);
+
+ALTER TABLE employee AUTO_INCREMENT=1; 
+
+ALTER TABLE employee
+MODIFY id int AUTO_INCREMENT;
+
+ALTER TABLE employee AUTO_INCREMENT=100;
+
+INSERT INTO employee (name, age, salary)
+VALUES ("Arham", 51, 250001);
+
+SELECT * FROM employee;
+
+ALTER TABLE employee 
+MODIFY time_today DATETIME;
+
+INSERT INTO employee (name, age, salary, time_today)
+VALUES ("Naveed1", 51, 250001, "2022-08-31 23:01:01");
+
+LOAD DATA LOCAL INFILE '/Users/aqadeer/Desktop/bank_customer.csv '
+INTO TABLE bank
+FIELDS TERMINATED BY ',' ENCLOSED BY '"'
+LINES TERMINATED BY '\n';
+
+select * from bank;
+
+CREATE TABLE bank (
+customer_id INT,
+credit_score INT, 
+country VARCHAR(255),
+gender VARCHAR(255),
+age INT,
+tenure INT,
+balance INT,
+products_number INT,
+credit_card INT,
+active_member INT,
+estimated_salary FLOAT,
+churn INT);
+
+select @@GLOBAL.secure_file_priv;
+
+SHOW VARIABLES LIKE "secure_file_priv";
+set global secure_file_priv = "/Users/aqadeer/Desktop";
+
+show variables like "local_infile";
+set global local_infile = 1;
+
+select * from bank where age > 40 AND age < 50;
+
+ALTER TABLE bank
+ADD COLUMN starting_age INT;
+
+ALTER TABLE bank
+DROP starting_age;
+
+UPDATE bank SET starting_age = age - tenure;
+
+Select DISTINCT age AS record_count FROM bank
+ ORDER BY age DESC;
+ 
+select * from bank;
+
+SELECT country, age, tenure, balance, churn, starting_age FROM bank
+ WHERE age > 50
+ ORDER BY age;
+
+select COUNT(*) from bank 
+where age  = 24;
+
+SELECT * FROM bank
+WHERE estimated_salary LIKE "1____0"
+ORDER BY age;
+
+SELECT * FROM bank 
+WHERE country NOT IN ("Germany", "France", "Spain") AND balance <= 100000;
+

intermediate.sql

+CREATE TABLE player (
+full_school_name VARCHAR(255),
+school_name VARCHAR(255),
+player_name VARCHAR(255),
+position VARCHAR(255),
+height FLOAT,
+weight FLOAT,
+year VARCHAR(255),
+home_town VARCHAR(255),
+state VARCHAR(255),
+id INT PRIMARY KEY);
+
+
+CREATE TABLE team(
+division VARCHAR(255),
+conference VARCHAR(255),
+school_name VARCHAR(255),
+roster_url VARCHAR(512),
+id INT PRIMARY KEY);
+

joins.sql

+-- create teams table with required header then import data from csv file.
+CREATE TABLE teams(
+division VARCHAR(255),
+conference VARCHAR(255),
+school_name VARCHAR(255),
+roster_url VARCHAR(512),
+id INT PRIMARY KEY);
+
+-- create player table
+CREATE TABLE players (
+full_school_name VARCHAR(255),
+school_name VARCHAR(255),
+player_name VARCHAR(255),
+position VARCHAR(255),
+height FLOAT,
+weight FLOAT,
+year VARCHAR(255),
+home_town VARCHAR(255),
+state VARCHAR(255),
+id INT PRIMARY KEY);
+
+select * from teams;
+
+-- join is same as inner join
+select teams.conference, players.height
+from players 
+join teams 
+on teams.school_name = players.school_name 
+where players.height < 80
+group by teams.conference,players.height; 
+
+select * from players;
+
+select year,
+height,
+count(height) as height_count
+from players
+group by year, height
+order by year desc, height desc;
+
+select players.school_name,
+teams.school_name
+from players
+join teams
+on players.school_name = teams.school_name
+order by players.weight;
+
+-- this is a comment
+select players.player_name,
+players.school_name,
+teams.conference,
+teams.division
+from players
+inner join teams
+on players.school_name = teams.school_name
+where teams.division = 'FBS (Division I-A Teams)';
+

player.sql

+SELECT * FROM testdb.player;
+
+SELECT AVG(weight) AS average_weight FROM player;

team.sql

+SELECT * FROM testdb.team;
+SELECT conference FROM team;