WebAppDB

WebApp on Azure & Database Connectivity

You can use the following resources as a reference for the Azure Web App and Virtual Network Integration The following can be used as a reference.

Create & Launch instance | Connect \ Update machine

sudo apt update -y

\ Set Password

sudo -i passwd

\ Install MySQL

sudo yum install mysql -y

OR

sudo yum install -y https://dev.mysql.com/get/mysql80-community-release-el9-5.noarch.rpm
sudo apt install mysql-server -y

// Sign in to MYSQL

mysql -u root -p

Download https://sqlectron.github.io/ and open it.
Add SG Inbount of EC2 - MySQL:3306
Insert Public ip, username, password, database name

First go ahead and download the MySQL server community edition on the server. https://dev.mysql.com/downloads/windows/installer/8.0.html
The following commands can be executed in MySQL Workbench for the creation of the database, table and adding of data a) Create the database

create database appdb;

b) Change to the context to the database

use appdb;

c) Create a table

CREATE TABLE Course
(CourseID int, CourseName varchar(1000),  Rating numeric(2,1));

d) Insert records into the table

INSERT INTO Course(CourseID,CourseName,Rating) VALUES(1,'AZ-204 Developing Azure solutions',4.5);
INSERT INTO Course(CourseID,CourseName,Rating) VALUES(2,'AZ-303 Architecting Azure solutions',4.6); 
INSERT INTO Course(CourseID,CourseName,Rating) VALUES(3,'DP-203 Azure Data Engineer',4.7);

g) See the data in the table

SELECT * FROM Course;

MySQL Cheat Sheet

Help with SQL commands to interact with a MySQL database

MySQL Locations

Mac /usr/local/mysql/bin
Windows /Program Files/MySQL/MySQL version/bin
Xampp /xampp/mysql/bin

Add mysql to your PATH

# Current Session
export PATH=${PATH}:/usr/local/mysql/bin
# Permanantly
echo 'export PATH="/usr/local/mysql/bin:$PATH"' >> ~/.bash_profile

On Windows - https://www.qualitestgroup.com/resources/knowledge-center/how-to-guide/add-mysql-path-windows/

Login

mysql -u root -p

Show Users

SELECT User, Host FROM mysql.user;

Create User

CREATE USER 'someuser'@'localhost' IDENTIFIED BY 'somepassword';

Grant All Priveleges On All Databases

GRANT ALL PRIVILEGES ON * . * TO 'someuser'@'localhost';
FLUSH PRIVILEGES;

Show Grants

SHOW GRANTS FOR 'someuser'@'localhost';

Remove Grants

REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'someuser'@'localhost';

Delete User

DROP USER 'someuser'@'localhost';

Exit

exit;

Show Databases

SHOW DATABASES

Create Database

CREATE DATABASE acme;

Delete Database

DROP DATABASE acme;

Select Database

USE acme;

Create Table

CREATE TABLE users(
id INT AUTO_INCREMENT,
   first_name VARCHAR(100),
   last_name VARCHAR(100),
   email VARCHAR(50),
   password VARCHAR(20),
   location VARCHAR(100),
   dept VARCHAR(100),
   is_admin TINYINT(1),
   register_date DATETIME,
   PRIMARY KEY(id)
);

Delete / Drop Table

DROP TABLE tablename;

Show Tables

SHOW TABLES;

Insert Row / Record

INSERT INTO users (first_name, last_name, email, password, location, dept, is_admin, register_date) values ('Brad', 'Traversy', '[email protected]', '123456','Massachusetts', 'development', 1, now());

Insert Multiple Rows

INSERT INTO users (first_name, last_name, email, password, location, dept,  is_admin, register_date) values ('Fred', 'Smith', '[email protected]', '123456', 'New York', 'design', 0, now()), ('Sara', 'Watson', '[email protected]', '123456', 'New York', 'design', 0, now()),('Will', 'Jackson', '[email protected]', '123456', 'Rhode Island', 'development', 1, now()),('Paula', 'Johnson', '[email protected]', '123456', 'Massachusetts', 'sales', 0, now()),('Tom', 'Spears', '[email protected]', '123456', 'Massachusetts', 'sales', 0, now());

Select

SELECT * FROM users;
SELECT first_name, last_name FROM users;

Where Clause

SELECT * FROM users WHERE location='Massachusetts';
SELECT * FROM users WHERE location='Massachusetts' AND dept='sales';
SELECT * FROM users WHERE is_admin = 1;
SELECT * FROM users WHERE is_admin > 0;

Delete Row

DELETE FROM users WHERE id = 6;

Update Row

UPDATE users SET email = '[email protected]' WHERE id = 2;

Add New Column

ALTER TABLE users ADD age VARCHAR(3);

Modify Column

ALTER TABLE users MODIFY COLUMN age INT(3);

Order By (Sort)

SELECT * FROM users ORDER BY last_name ASC;
SELECT * FROM users ORDER BY last_name DESC;

Concatenate Columns

SELECT CONCAT(first_name, ' ', last_name) AS 'Name', dept FROM users;

Select Distinct Rows

SELECT DISTINCT location FROM users;

Between (Select Range)

SELECT * FROM users WHERE age BETWEEN 20 AND 25;

Like (Searching)

SELECT * FROM users WHERE dept LIKE 'd%';
SELECT * FROM users WHERE dept LIKE 'dev%';
SELECT * FROM users WHERE dept LIKE '%t';
SELECT * FROM users WHERE dept LIKE '%e%';

Not Like

SELECT * FROM users WHERE dept NOT LIKE 'd%';

IN

SELECT * FROM users WHERE dept IN ('design', 'sales');

Create & Remove Index

CREATE INDEX LIndex On users(location);
DROP INDEX LIndex ON users;

New Table With Foreign Key (Posts)

CREATE TABLE posts(
id INT AUTO_INCREMENT,
   user_id INT,
   title VARCHAR(100),
   body TEXT,
   publish_date DATETIME DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY(id),
   FOREIGN KEY (user_id) REFERENCES users(id)
);

Add Data to Posts Table

INSERT INTO posts(user_id, title, body) VALUES (1, 'Post One', 'This is post one'),(3, 'Post Two', 'This is post two'),(1, 'Post Three', 'This is post three'),(2, 'Post Four', 'This is post four'),(5, 'Post Five', 'This is post five'),(4, 'Post Six', 'This is post six'),(2, 'Post Seven', 'This is post seven'),(1, 'Post Eight', 'This is post eight'),(3, 'Post Nine', 'This is post none'),(4, 'Post Ten', 'This is post ten');

INNER JOIN

SELECT
  users.first_name,
  users.last_name,
  posts.title,
  posts.publish_date
FROM users
INNER JOIN posts
ON users.id = posts.user_id
ORDER BY posts.title;

New Table With 2 Foriegn Keys

CREATE TABLE comments(
	id INT AUTO_INCREMENT,
    post_id INT,
    user_id INT,
    body TEXT,
    publish_date DATETIME DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY(id),
    FOREIGN KEY(user_id) references users(id),
    FOREIGN KEY(post_id) references posts(id)
);

Add Data to Comments Table

INSERT INTO comments(post_id, user_id, body) VALUES (1, 3, 'This is comment one'),(2, 1, 'This is comment two'),(5, 3, 'This is comment three'),(2, 4, 'This is comment four'),(1, 2, 'This is comment five'),(3, 1, 'This is comment six'),(3, 2, 'This is comment six'),(5, 4, 'This is comment seven'),(2, 3, 'This is comment seven');

Left Join

SELECT
comments.body,
posts.title
FROM comments
LEFT JOIN posts ON posts.id = comments.post_id
ORDER BY posts.title;

Join Multiple Tables

SELECT
comments.body,
posts.title,
users.first_name,
users.last_name
FROM comments
INNER JOIN posts on posts.id = comments.post_id
INNER JOIN users on users.id = comments.user_id
ORDER BY posts.title;

Aggregate Functions

SELECT COUNT(id) FROM users;
SELECT MAX(age) FROM users;
SELECT MIN(age) FROM users;
SELECT SUM(age) FROM users;
SELECT UCASE(first_name), LCASE(last_name) FROM users;

Group By

SELECT age, COUNT(age) FROM users GROUP BY age;
SELECT age, COUNT(age) FROM users WHERE age > 20 GROUP BY age;
SELECT age, COUNT(age) FROM users GROUP BY age HAVING count(age) >=2;

title: MySQL updated: 2020-07-05 layout: 2017/sheet category: Databases

Browsing

SHOW DATABASES;
SHOW TABLES;
SHOW FIELDS FROM table / DESCRIBE table;
SHOW CREATE TABLE table;
SHOW PROCESSLIST;
KILL process_number;

Select

SELECT * FROM table;
SELECT * FROM table1, table2;
SELECT field1, field2 FROM table1, table2;
SELECT ... FROM ... WHERE condition
SELECT ... FROM ... WHERE condition GROUP BY field;
SELECT ... FROM ... WHERE condition GROUP BY field HAVING condition2;
SELECT ... FROM ... WHERE condition ORDER BY field1, field2;
SELECT ... FROM ... WHERE condition ORDER BY field1, field2 DESC;
SELECT ... FROM ... WHERE condition LIMIT 10;
SELECT DISTINCT field1 FROM ...
SELECT DISTINCT field1, field2 FROM ...

Select - Join

SELECT ... FROM t1 JOIN t2 ON t1.id1 = t2.id2 WHERE condition;
SELECT ... FROM t1 LEFT JOIN t2 ON t1.id1 = t2.id2 WHERE condition;
SELECT ... FROM t1 JOIN (t2 JOIN t3 ON ...) ON ...

Conditions

field1 = value1
field1 <> value1
field1 LIKE 'value _ %'
field1 IS NULL
field1 IS NOT NULL
field1 IS IN (value1, value2)
field1 IS NOT IN (value1, value2)
condition1 AND condition2
condition1 OR condition2

Create / Open / Delete Database

CREATE DATABASE DatabaseName;
CREATE DATABASE DatabaseName CHARACTER SET utf8;
USE DatabaseName;
DROP DATABASE DatabaseName;
ALTER DATABASE DatabaseName CHARACTER SET utf8;

Backup Database to SQL File

mysqldump -u Username -p dbNameYouWant > databasename_backup.sql

Restore from backup SQL File

mysql -u Username -p dbNameYouWant < databasename_backup.sql;

Repair Tables After Unclean Shutdown

mysqlcheck --all-databases;
mysqlcheck --all-databases --fast;

Insert

INSERT INTO table1 (field1, field2) VALUES (value1, value2);

Delete

DELETE FROM table1 / TRUNCATE table1
DELETE FROM table1 WHERE condition
DELETE FROM table1, table2 WHERE table1.id1 =
  table2.id2 AND condition

Update

UPDATE table1 SET field1=new_value1 WHERE condition;
UPDATE table1, table2 SET field1=new_value1, field2=new_value2, ... WHERE
  table1.id1 = table2.id2 AND condition;

Create / Delete / Modify Table

Create

CREATE TABLE table (field1 type1, field2 type2);
CREATE TABLE table (field1 type1, field2 type2, INDEX (field));
CREATE TABLE table (field1 type1, field2 type2, PRIMARY KEY (field1));
CREATE TABLE table (field1 type1, field2 type2, PRIMARY KEY (field1,field2));

CREATE TABLE table1 (fk_field1 type1, field2 type2, ...,
  FOREIGN KEY (fk_field1) REFERENCES table2 (t2_fieldA))
    [ON UPDATE|ON DELETE] [CASCADE|SET NULL]

CREATE TABLE table1 (fk_field1 type1, fk_field2 type2, ...,
 FOREIGN KEY (fk_field1, fk_field2) REFERENCES table2 (t2_fieldA, t2_fieldB))

CREATE TABLE table IF NOT EXISTS;

CREATE TEMPORARY TABLE table;

Drop

DROP TABLE table;
DROP TABLE IF EXISTS table;
DROP TABLE table1, table2, ...

Alter

ALTER TABLE table MODIFY field1 type1
ALTER TABLE table MODIFY field1 type1 NOT NULL ...
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 NOT NULL ...
ALTER TABLE table ALTER field1 SET DEFAULT ...
ALTER TABLE table ALTER field1 DROP DEFAULT
ALTER TABLE table ADD new_name_field1 type1
ALTER TABLE table ADD new_name_field1 type1 FIRST
ALTER TABLE table ADD new_name_field1 type1 AFTER another_field
ALTER TABLE table DROP field1
ALTER TABLE table ADD INDEX (field);

Change field order

ALTER TABLE table MODIFY field1 type1 FIRST
ALTER TABLE table MODIFY field1 type1 AFTER another_field
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 FIRST
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 AFTER
  another_field

Keys

CREATE TABLE table (..., PRIMARY KEY (field1, field2))
CREATE TABLE table (..., FOREIGN KEY (field1, field2) REFERENCES table2
(t2_field1, t2_field2))

Users and Privileges

CREATE USER 'user'@'localhost';
GRANT ALL PRIVILEGES ON base.* TO 'user'@'localhost' IDENTIFIED BY 'password';
GRANT SELECT, INSERT, DELETE ON base.* TO 'user'@'localhost' IDENTIFIED BY 'password';
REVOKE ALL PRIVILEGES ON base.* FROM 'user'@'host'; -- one permission only
REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'user'@'host'; -- all permissions
FLUSH PRIVILEGES;

SET PASSWORD = PASSWORD('new_pass');
SET PASSWORD FOR 'user'@'host' = PASSWORD('new_pass');
SET PASSWORD = OLD_PASSWORD('new_pass');

DROP USER 'user'@'host';

Host ‘%’ indicates any host.

Main Data Types

TINYINT (1o: -128 to +127)
SMALLINT (2o: +-65 000)
MEDIUMINT (3o: +-16 000 000)
INT (4o: +- 2 000 000 000)
BIGINT (8o: +-9.10^18)

Precise interval: -(2^(8*N-1)) -> (2^8*N)-1

⚠ INT(2) = "2 digits displayed" -- NOT "number with 2 digits max"

FLOAT(M,D)
DOUBLE(M,D)
FLOAT(D=0->53)

⚠ 8,3 -> 12345,678 -- NOT 12345678,123!

TIME (HH:MM)
YEAR (AAAA)
DATE (AAAA-MM-JJ)
DATETIME (AAAA-MM-JJ HH:MM; années 1000->9999)
TIMESTAMP (like DATETIME, but 1970->2038, compatible with Unix)

VARCHAR (single-line; explicit size)
TEXT (multi-lines; max size=65535)
BLOB (binary; max size=65535)

Variants for TEXT&BLOB: TINY (max=255), MEDIUM (max=~16000), and LONG (max=4Go). Ex: VARCHAR(32), TINYTEXT, LONGBLOB, MEDIUMTEXT

ENUM ('value1', 'value2', ...) -- (default NULL, or '' if NOT NULL)

Reset Root Password

$ /etc/init.d/mysql stop

$ mysqld_safe --skip-grant-tables

$ mysql # on another terminal
mysql> UPDATE mysql.user SET password=PASSWORD('new_pass') WHERE user='root';

## Switch back to the mysqld_safe terminal and kill the process using Control + \
$ /etc/init.d/mysql start

Your commands may vary depending on your OS.

Name		Name	Last commit message	Last commit date
Latest commit History 39 Commits
.vs		.vs
sqlapp		sqlapp
README.md		README.md
SQLvsNOSQL.md		SQLvsNOSQL.md
WebAppDB.zip		WebAppDB.zip
azure-vm-commands.md		azure-vm-commands.md
sqlapp.sln		sqlapp.sln

atulkamble/WebAppDB

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WebAppDB

MySQL Cheat Sheet

MySQL Locations

Add mysql to your PATH

Login

Show Users

Create User

Grant All Priveleges On All Databases

Show Grants

Remove Grants

Delete User

Exit

Show Databases

Create Database

Delete Database

Select Database

Create Table

Delete / Drop Table

Show Tables

Insert Row / Record

Insert Multiple Rows

Select

Where Clause

Delete Row

Update Row

Add New Column

Modify Column

Order By (Sort)

Concatenate Columns

Select Distinct Rows

Between (Select Range)

Like (Searching)

Not Like

IN

Create & Remove Index

New Table With Foreign Key (Posts)

Add Data to Posts Table

INNER JOIN

New Table With 2 Foriegn Keys

Add Data to Comments Table

Left Join

Join Multiple Tables

Aggregate Functions

Group By

title: MySQL updated: 2020-07-05 layout: 2017/sheet category: Databases

Browsing

Select

Select - Join

Conditions

Create / Open / Delete Database

Backup Database to SQL File

Restore from backup SQL File

Repair Tables After Unclean Shutdown

Insert

Delete

Update

Create / Delete / Modify Table

Create

Drop

Alter

Change field order

Keys

Users and Privileges

Main Data Types

Reset Root Password

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