MYSQL
LEFT OUTER JOIN
Return all records from the left table, and the matched records from the right table
RIGHT OUTER JOIN
Return all records from the right table, and the matched records from the left table
FULL OUTER JOIN
Return all records when there is a match in either left or right table
INNER JOIN
Returns records that have matching values in both tables
Database
is a separate application that stores a collection of data. Each database has one or more distinct APIs for creating, accessing, managing, searching and replicating the data it holds.
full join
is also called a cross join because each row of each table is crossed with each row in every other table to produce all possible combinations.
Database redundancy
is needed to ensure that database operations are still at present in the event that an outage takes place in an enterprise setting
foreign key
is the linking pin between two tables.
MySQL
is the most popular Open Source SQL Database Management System.
primary key
is unique and cannot occur twice in one table
David Axmark, Allan Larsson and Michael Widenius
mysql founded by
p
stands for password
u
stands for username
Rows
contain a group of related data
LEFT and RIGHT JOIN
"Everything that a query sees from the left reference is that one that it is being queried by the database" No match would mean Null Doing a right join would be just the complete reversal of a left join
standby database
. A _ server takes over should there be any issues that the primary server encounters failover setup
Relational DataBase Management System
> Enables you to implement a database with tables, columns and indexes. > Guarantees the Referential Integrity between rows of various tables. > Updates the indexes automatically. > Interprets an SQL query and combines information
The Flexibility of Open Source
All the fears and worries that arise in an open source solution can be brought to an end with My SQL's round-the-clock support and enterprise indemnification. The secure processing and trusted software of MySQL combine to provide effective transactions for large volume projects. It makes maintenance, debugging and upgrades fast and easy while enhancing the end-user experience.
Reduced Total Cost of Ownership
By migrating current database apps to MySQL, enterprises are enjoying significant cost savings on new projects. The dependability and ease of management that accompany MySQL save your troubleshooting time which is otherwise wasted in fixing downtime issues and performance problems.
Inner JOIN
Captures the common items at present in two or more different tables.
MySQL AB
Developed by a Swedish company named _
mysql.exe -u root -p
In CLI we can connect in this manner
other commands
List all indexes on a table: show index from [table]; Adding a column: ALTER TABLE [table] ADD COLUMN [column] VARCHAR(120); Adding a column with an unique, auto-incrementing ID: ALTER TABLE [table] ADD COLUMN [column] int NOT NULL AUTO_INCREMENT PRIMARY KEY; Explain records: EXPLAIN SELECT * FROM [table]; Selecting parts of records: SELECT [column], [another-column] FROM [table]; Counting records: SELECT COUNT([column]) FROM [table]; Updating records: UPDATE [table] SET [column] = '[updated-value]' WHERE [column] = [value]; Deleting records: DELETE FROM [table] WHERE [column] = [value]; Delete all records from a table (without dropping the table itself): DELETE FROM [table]; Delete all records in a table: truncate table [table]; Removing table columns: ALTER TABLE [table] DROP COLUMN [column]; Deleting tables: DROP TABLE [table]; Deleting databases: DROP DATABASE [database];
David Axmark and Michael Widenius
MySQL authors were
Round-the-clock Uptime
MySQL comes with the assurance of 24X7 uptime and offers a wide range of high availability solutions like specialized cluster servers and master/slave replication configurations.
High Performance
MySQL features a distinct storage-engine framework that facilitates system administrators to configure the MySQL database server for a flawless performance. Whether it is an eCommerce website that receives a million queries every single day or a high-speed transactional processing system, MySQL is designed to meet even the most demanding applications while ensuring optimum speed, full-text indexes and unique memory caches for enhanced performance.
free-of-charge enterprise subscription
MySQL has two lines of support:
daughter
MySQL is a two word name where the word 'My' was named after Michael Widenius's
Data Security
MySQL is globally renowned for being the most secure and reliable database management system used in popular web applications like WordPress, Drupal, Joomla, Facebook and Twitter. The data security and support for transactional processing that accompany the recent version of MySQL, can greatly benefit any business especially if it is an eCommerce business that involves frequent money transfers.
On-Demand Scalability
MySQL offers unmatched scalability to facilitate the management of deeply embedded apps using a smaller footprint even in massive warehouses that stack terabytes of data. On-demand flexibility is the star feature of MySQL. This open source solution allows complete customization to eCommerce businesses with unique database server requirements.
Comprehensive Transactional Support
MySQL tops the list of robust transactional database engines available on the market. With features like complete atomic, consistent, isolated, durable transaction support, multi-version transaction support, and unrestricted row-level locking, it is the go-to solution for full data integrity. It guarantees instant deadlock identification through server-enforced referential integrity.
C and C++
MySQL was developed using the _ as its native language
ORACLE
Nowadays, _ already bought the rights and offerings for MySQL
give-back operation
Once the issue is resolve, the secondary / standby server then gives back the service to the primary server called
SQL API
SQL simply because it is built as
;
Take note that the default delimiter for MySQL is
23 May 1995
The first version of MySQL appeared on
8 2016
There are _ releases for MySQL where the latest version was released last _
full join
This is also known as the cartesian product.
describe tblname;
To check the table attributes in MySQL invoke the
create database dbname;
To create a databases in MySQL invoke the
create table tblname, colname type;
To create tables in MySQL invoke the
insert into tblname (col1,col2) values (val1, val2);
To insert table values in MySQL invoke the
select * from tblname;
To select table values in MySQL invoke the
show tables;
To show all of your created tables in database in MySQL invoke the
show databases;
To show available databases in MySQL invoke the command.
use dbname;
To switch databases in MySQL invoke the
Complete Workflow Control
With the average download and installation time being less than 30 minutes, MySQL means usability from day one. Whether your platform is Linux, Microsoft, Macintosh or UNIX, MySQL is a comprehensive solution with self-management features that automate everything from space expansion and configuration to data design and database administration.
Columns
contain data of one and the same kind
client connect command submit parser query check grammar optimize space speed time completed capture logs data seen client
db birds eye