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https://github.com/moindalvs/sql_basic-queries_

MySQL
https://github.com/moindalvs/sql_basic-queries_
microsoft-sql-server mysql mysql-database mysql-workbench sql sql-server
Last synced: about 2 months ago
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MySQL
Host: GitHub
URL: https://github.com/moindalvs/sql_basic-queries_
Owner: MoinDalvs
Created: 2022-09-11T09:12:03.000Z (over 2 years ago)
Default Branch: main
Last Pushed: 2022-09-11T09:13:20.000Z (over 2 years ago)
Last Synced: 2024-10-13T07:23:25.033Z (3 months ago)
Topics: microsoft-sql-server, mysql, mysql-database, mysql-workbench, sql, sql-server
Homepage:
Size: 6.84 KB
Stars: 1
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
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README

        # SQL_Queries_Basic

-- CODING COURSE BY GIRAFFE ACADEMY 

-- BASICS OF SQL

SELECT * FROM student;

DROP TABLE student;

ALTER TABLE student ADD gpa DECIMAL(3, 2);

ALTER TABLE student DROP COLUMN gpa;

CREATE TABLE student (

      student_id INT PRIMARY KEY,

      name VARCHAR(20),

      major VARCHAR(20)

);

DESCRIBE student;

INSERT INTO student 

VALUES(1, 'Jack', 'Biology');

INSERT INTO student (student_id, name, major)

VAlUES(1, 'Jack', 'Biology'),

    (2, 'Kate', 'Sociology'),

    (3, 'Claire', 'English'),

    (4, 'Jack', 'Chemistry'),

    (5, 'Mike', 'Computer Science');

CREATE TABLE student (

      student_id INT,

      name VARCHAR(20) NOT NULL,

      major VARCHAR(20) UNIQUE,

      PRIMARY KEY(student_id) 

);

INSERT INTO student (student_id, name, major)

VAlUES(1, 'Jack', 'Biology'),

    (2, NULL, 'Sociology'),

    (3, 'Claire', 'English'),

    (4, 'Jack', 'Chemistry'),

    (5, 'Mike', 'Computer Science');

INSERT INTO student (student_id, name, major)

VAlUES(1, 'Jack', 'Biology'),

    (2, NULL, 'Sociology'),

    (3, 'Claire', 'English'),

    (4, 'Jack', 'Biology'),

    (5, 'Mike', 'Computer Science');

CREATE TABLE student (

      student_id INT,

      name VARCHAR(20) ,

      major VARCHAR(20) DEFAULT 'undecided',

      PRIMARY KEY(student_id) 

);

INSERT INTO student (student_id, name)

VALUES (1, 'Jack');

CREATE TABLE student (

    student_id INT AUTO_INCREMENT,

    name VARCHAR(20),

    major VARCHAR(10),

    PRIMARY KEY(student_id)

);

INSERT INTO student (name, major)

VALUES ('Jack', 'Sociology'),

       ('Kate', 'Biology');

CREATE TABLE student (

    student_id INT AUTO_INCREMENT,

    name VARCHAR(20),

    major VARCHAR(20),

    PRIMARY KEY(student_id)

);

INSERT INTO student (name, major)

VALUES ('Jack', 'Biology'),

       ('Kate', 'Sociology'),

       ('Claire', 'Chemistry'),

       ('Jack', 'Biology'),

       ('Mike', 'Computer Science');

UPDATE student

SET major = 'English'

WHERE student_id = '4';

UPDATE student

SET major = 'Chemistry'

WHERE name = 'Claire';

DELETE FROM student

WHERE student_id = '5';

DROP TABLE student;

-- CORPORATE EXCERCISE CREATING COMPANY DATABASE

CREATE TABLE Employee (

    employee_id INT PRIMARY KEY,

    first_name VARCHAR(10),

    last_name  VARCHAR(10),

    birth_date DATE,

    sex VARCHAR(1),

    salary INT,

    supervisor_id INT,

    branch_id INT

      );

CREATE TABLE Branch (

    branch_id INT PRIMARY KEY,

    branch_name VARCHAR(10),

    manager_id INT,

    manager_start_date DATE,

    FOREIGN KEY(manager_id) REFERENCES Employee(employee_id) ON DELETE SET NULL

);

CREATE TABLE Client (

    client_id INT PRIMARY KEY,

    client_name VARCHAR(20),

    branch_id INT,

    FOREIGN KEY (branch_id) REFERENCES Branch(branch_id) ON DELETE SET NULL

    );

CREATE TABLE Works_With(

    employee_id INT,

    client_id INT,

    total_sales INT,

    PRIMARY KEY (employee_id, client_id),

    FOREIGN KEY (employee_id) REFERENCES Employee(employee_id) ON DELETE CASCADE,

    FOREIGN KEY (client_id) REFERENCES Client(client_id) ON DELETE CASCADE

);

CREATE TABLE Branch_Supplier (

 branch_id INT,

 supplier_name VARCHAR(20),

 supply_type VARCHAR(20),

 FOREIGN KEY(branch_id) REFERENCES Branch(branch_id) ON DELETE CASCADE

);

ALTER TABLE Employee

ADD FOREIGN KEY(supervisor_id)

REFERENCES Employee(employee_id)

ON DELETE SET NULL ;

ALTER TABLE Employee

ADD FOREIGN KEY (branch_id)

REFERENCES Branch(branch_id)

ON DELETE SET NULL ;

-- Employee

INSERT INTO Employee (employee_id, first_name, last_name, birth_date, sex, salary, supervisor_id, branch_id)

VALUES (100, 'David', 'Wallace', '1967-11-17', 'M', 250000, NULL, NULL),

       (101, 'Jan', 'Levinson', '1961-05-11', 'F', 110000, 100, NULL),

       (102, 'Michael', 'Scott', '1964-03-15', 'M', 75000, 100, NULL),

       (103, 'Angela', 'Martin', '1971-06-25', 'F', 63000, 102, NULL),

       (104, 'Kelly', 'Kapoor', '1980-02-05', 'F', 55000, 102, NULL),

       (105, 'Stanley', 'Hudson', '1958-02-19', 'M', 69000, 102, NULL),

       (106, 'Josh', 'Porter', '1969-09-05', 'M', 78000, 100, NULL),

       (107, 'Andy', 'Bernard', '1973-07-22', 'M', 65000, 106, NULL),

       (108, 'Jim', 'Halpert', '1978-10-01', 'M', 71000, 106, NULL);

       

-- Branch

INSERT INTO Branch

VALUES (1, 'Corporate', 100, '2006-02-09'),

       (2, 'Scranton', 102, '1992-04-06'),

       (3, 'Stamford', 106, '1998-02-13');

-- Corporate Branch

UPDATE Employee

SET branch_id = 1

WHERE employee_id <= 101;

-- Scranton Branch 

UPDATE Employee

SET branch_id = 2

WHERE employee_id BETWEEN 102 AND 105;

-- Stamford Branch 

UPDATE Employee

SET branch_id = 3

WHERE employee_id >= 106;

-- Branch Supllier

INSERT INTO Branch_Supplier 

VALUES(2, 'Hammer Mill', 'Paper'),

      (2, 'Uni-Ball', 'Writing Utensils'),

      (3, 'Patriot Paper', 'Paper'),

      (2, 'J.T. Forms & Labels', 'Custom Forms'),

      (3, 'Uni-Ball', 'Writing Utensils'),

      (3, 'Hammer Mill', 'Paper'),

      (3, 'Stamford Lables', 'Custom Forms');

-- Client

INSERT INTO Client

VALUES(400, 'Dunmore Highschool', 2),

      (401, 'Lackwana Country', 2),

      (402, 'FedEx', 3),

      (403, 'John Daly Law, LLC', 3),

      (404, 'Scranton Whitepages', 2),

      (405, 'Times Newspaper', 3),

      (406, 'FedEx', 2);

-- Works_With

INSERT INTO Works_With

VALUES(105, 400, 55000),

      (102, 401, 267000),

      (108, 402, 22500),

      (107, 403, 5000),

      (108, 403, 12000),

      (105, 404, 33000),

      (107, 405, 26000),

      (102, 406, 15000),

      (105, 406, 130000);

      

DROP TABLE Employee, Branch, Client, Works_With, Branch_Supplier;

SELECT * FROM Employee;

SELECT * FROM Branch;

SELECT * FROM Branch_Supplier;

SELECT * FROM Client;

SELECT * FROM Works_With;

SELECT DISTINCT sex FROM Employee;

SELECT * FROM Employee ORDER BY salary;

SELECT * FROM Employee LIMIT 5;

SELECT COUNT(employee_id)

FROM Employee;

SELECT COUNT (employee_id)

FROM Employee

WHERE sex = 'F' AND birth_date >= '1971-01-01';

SELECT AVG (salary)

FROM Employee

WHERE sex = 'M';

SELECT SUM(salary)

FROM Employee;

SELECT COUNT(sex), sex

FROM Employee

GROUP BY sex;

SELECT SUM(total_sales), employee_id

FROM Works_With

GROUP BY employee_id;

SELECT *

FROM Client

WHERE client_name LIKE '%LLC%';

SELECT *

FROM Branch_Supplier

WHERE supplier_name LIKE '%Label%';

UPDATE Branch_Supplier

SET supplier_name = 'Stamford Labels'

WHERE branch_id = 3 AND supply_type = 'Custom Forms';

SELECT *

FROM Employee

WHERE birth_date LIKE '%10%';

SELECT *

FROM Employee

WHERE birth_date LIKE '____-10%';

SELECT *

FROM Employee

WHERE birth_date LIKE '%02%';

SELECT *

FROM Client

WHERE client_name LIKE '%School%';

SELECT first_name FROM Employee

UNION

SELECT branch_name FROM Branch;

SELECT E.employee_id, E.first_name, E.last_name, B.branch_id, B.branch_name, E.salary

FROM Employee E

JOIN Branch B

ON E.employee_id = B.manager_id;

SELECT E.first_name, E.last_name, WW.total_sales, C.client_name

FROM Works_With WW

JOIN Employee E

USING (employee_id)

JOIN Client C

USING (client_id)

WHERE WW.total_sales > 30000;

SELECT E.first_name, E.last_name

FROM Employee E

WHERE E.employee_id IN (

    SELECT WW.employee_id

FROM Works_With WW

WHERE WW.total_sales > 30000);

SELECT C.client_name

FROM client C

WHERE branch_id IN(

SELECT B.branch_id

FROM Branch B

WHERE B.manager_id = 102);

-- CREATE TABLE Branch (

  --  branch_id INT PRIMARY KEY,

  --  branch_name VARCHAR(10),

  --  manager_id INT,

  --  manager_start_date DATE,

  --  FOREIGN KEY(manager_id) REFERENCES Employee(employee_id) ON DELETE SET NULL);

DELETE FROM Employee

WHERE employee_id = 102;

-- CREATE TABLE Branch_Supplier (

-- branch_id INT,

-- supplier_name VARCHAR(20),

-- supply_type VARCHAR(20),

-- FOREIGN KEY(branch_id) REFERENCES Branch(branch_id) ON DELETE CASCADE);

DELETE FROM Branch

WHERE branch_id = 2;

CREATE TABLE employee_trigger(

    message VARCHAR(100)

);

DELIMITER $$

CREATE 

TRIGGER New_Employee_trigger BEFORE INSERT

ON Employee

FOR EACH ROW BEGIN

INSERT INTO employee_trigger VALUES('Added New Employee');

END $$

DELIMITER ;

INSERT INTO Employee

VALUES (109, 'Oscar', 'Martinez', '1968-02-19', 'M', 69000, 106, 3);

SELECT * FROM employee_trigger;

DELIMITER $$

CREATE TRIGGER New_Employee_First_trigger 

BEFORE INSERT 

ON Employee 

FOR EACH ROW BEGIN

INSERT INTO employee_trigger VALUES (NEW.first_name);

END $$

DELIMITER ;

INSERT INTO Employee

VALUES (110, 'Kevin', 'Malone', '1978-05-28', 'M', 11000, 106, 3);

SELECT * FROM employee_trigger;

DELIMITER $$

CREATE TRIGGER sex_identifying_trigger 

BEFORE INSERT 

ON Employee 

FOR EACH ROW BEGIN

IF NEW.sex = 'M' THEN

INSERT INTO employee_trigger VALUES ('Added Male Employee');

ELSEIF NEW.sex = 'F' THEN

INSERT INTO employee_trigger VALUES ('Added Female Employee');

ELSE 

INSERT INTO employee_trigger VALUES ('Added Other Employee');

END IF;

END $$

DELIMITER ;

INSERT INTO Employee

VALUES (111, 'Pam', 'Beesly', '1988-07-08', 'F', 45000, 106, 3);

SELECT * FROM employee_trigger;

DELIMITER $$

CREATE TRIGGER sex_identifying_trigger 

BEFORE UPDATE;

DELIMITER $$

CREATE TRIGGER sex_identifying_trigger 

BEFORE DELETE;

DELIMITER $$

CREATE TRIGGER sex_identifying_trigger 

AFTER UPDATE;

DELIMITER $$

CREATE TRIGGER sex_identifying_trigger

AFTER DELETE;

DROP TRIGGER New_Employee_trigger;

DROP TRIGGER New_Employee_First_trigger;

DROP TRIGGER sex_identifying_trigger;