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Some useful information that will help you brush up on MySQL Interview Questions
Fast and Easy way to learn MySQL
SQL is a language whose full form is Standard Query Language. This language is specific to a domain. It is used for managing databases. It is based on a relational database model. One of the extended versions is MySQL which is an open source software used for relational database management system. It is also written as my sql. It allows both declarative and procedural programming. The declarative programming tells the result which needs to be accomplished by the software. The procedural programming tells the procedure through which the results need to be accomplished by the software. Some of the largest organizations around the globe commonly use MySQL or my sql.
How to start with MySQL?
The first step in the process is to download and install MySQL. Oracle Corporation owns MySQL. Oracle provides both the free and paid version of MySQL. It is available for Windows, OSX, Linux and Unix.
MySQL download could be done from any trusted website:
For the free version or General Public License (GPL) of, the link titled “Community (GPL) Downloads” should be click for mysql download.
On the new page, the user can download the relevant version for its use.
The installation of MySQL needs to be verified using the command mysqladmin. Mysqladmin provides detail about the version installed.
Another command mysql will connect to MySQL server.
MySQL could be made password protected as well as it could be operated at the Boot Time.
In order to manage the administration of the software over the cloud or web, phpmyadmin software can be installed and executed. It is free and is written in PHP. It could be downloaded from the website.
Tutorials for MySQL
MySQL tutorial focuses on providing the basic tips to get user started with MySQL.
The first step in learning MySQL is to learn to install the software, followed by downloading and loading the sample database. The sample database could be accessed from the website. The second step in learning MySQL is to learn to query the data. The two common and basic commands used are SELECT and SELECT DISTINCT:
SELECT command allows the querying of data. The data could be queried from a single table. It will show even duplicate rows.
SELECT DISTINCT command allows the elimination of the duplicate rows for the given data query.
The third step in learning MySQL is to learn to filter the data. The common and basic commands used are WHERE, AND, IN, OR, BETWEEN, LIKE, LIMIT and IS NULL.
WHERE command allows defining data selection conditions to filter rows.
AND and OR are Boolean command which allows combining data selection conditions to create complex conditions to filter rows.
IN command allows defining of the value that should be matched in the query to filter rows.
BETWEEN commands allows defining a range in which the filtered rows values could lie.
LIKE command is used for pattern based filtering of rows
LIMIT command is used to put a restriction on the number of rows filtered
IS NULL command is used to identify the NULL values in the database.
The fourth step in learning MySQL is to learn to sort and group the data. The common and basic command used is ORDER BY. This command allows the ordering of data in either ascending or descending order. In case of multiple columns, hierarchical sorting could also be done.
The fifth step in mysql tutorial learning is to learn to join the tables. The common and basic commands used are MySQL alias, INNER JOIN, LEFT JOIN, RIGHT JOIN, CROSS JOIN and Self-join.
MySQL alias command allows for giving alternate name to the columns for better readability and understanding of the columns.
INNER JOIN command is used to query data from multiple tables with rows containing same column.
LEFT JOIN command is used to select rows from leftmost table if the row contains column in other tables also.
RIGHT JOIN command is used to select rows from rightmost table if the row contains column in other tables also.
CROSS JOIN command is used to combine all rows of all tables. It performs Cartesian product of rows. For example, two tables with 100 rows each will be joined by CROSS JOIN command to create single table of 100*100=10000 rows.
Self-join command is used to join table with itself. It is different from other commands as other commands are used to join two or more tables together, this command is used to join a single table with itself.
The sixth step in learning mysql tutorial is to learn to modify the data. The common and basic command used is INSERT. This command allows insertion of data into the table.
Some of the many MySQL Interview Questions listed below will help you get an idea about what questions gets asked in such jobs related to Software Engineering & Tech. Get through the MySQL Interview bar with our selected MySQL Interview Questions for all MySQL enthusiasts!
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