How To List MySQL Databases (Step-by-Step Instructions in Code)

MySQL is one of today's most widely used relational database management platforms (RDBMS). It's a robust database platform that allows the creation and manage scalable databases by using a structured query language (SQL).

The MySQL server hosts that houses the databases -- and the location from which they can be accessed. As an administrator for the server, it's common to get information from this environment , including the databases on the server. It is also possible to display tables from a particular database, displaying tables from a particular database, showing rights and roles for users in addition to accessing limitations as well as accessing restrictions.

This article will provide the ins and outs of the procedure to list MySQL databases using the command prompt.

The prerequisites to list MySQL databases

It is necessary to have the MySQL server locally to your system before you can get it up and running. If you do not possess MySQL you can choose from a number of ways to get it set up:

• Download and install and run the MySQL installer on their official website. following the installation process to setup and install the MySQL server as well as other software.

To conveniently run MySQL commands with commands It is essential to include to add the MySQL executable's URL to the system's environment. If you've installed MySQL with option 2, this is not necessary and you are free to skip the next section.

Be sure to be sure to add the MySQL path to the system's Variables Environment

This article will guide you in how to add the MySQL executable path into the environment variable of your system, for use with XAMPP and WAMP for the Windows computer.

Open your Windows Explorer and navigate to this machine. Select the drive on which you've put the WAMP or XAMPP package ( C:).

If you're running XAMPP then navigate to the directory XAMPP first, then mysql > bin and copy the full path into bin. bin folder. For WAMP go to your-wamp version > bin > mysql your-mysql-version > > bin and copy the entire path.

Select the Start menu and search for "path." Then click Modify the system's environment variable.

Select on the variable Environment in Startup and Recovery and then click the PATH variable and then select edit.

Select New and copy the complete address of the MySQL executable (which you had copied previously).

Make the changes when you click "OK.".

Now that you have added the path it is possible to use MySQL commands using the terminal.

Log in to MySQL

In order to list MySQL databases, the user has to be granted access to the databases in question, or you must set an aggregate SHOW Databases privilege which grants the database to all users.

Check that you're MySQL server is running before logging into the server via the command prompt

mysql -u-p

Make sure to replace it with your username. The default username for MySQL is root and password is blank (there's no password in the default).

Create Databases within the MySQL Server

When you're logged in the server and logged in, you are able to list MySQL databases on the server by using the SHOW Databases command:

SHOW DASHBOARDS

This means that you will receive all the database, which is stored in the storage

Out of the six databases that are returned, information_schema and performance_schema are the default databases that are automatically generated when you install MySQL.

Information-schema database information_schema Database is an immutable database which holds all information related to databases and other objects (views as well as privileges of users, tables constraints, views, etc.) that are stored on MySQL. MySQL server.

Finding the Filter's Results from the Database Output

At one time, it was possible to retrieve all databases stored on the MySQL server by using Show Databases However, often you need to filter the information that is returned by the database especially in the event of many databases which are stored on the server.

It is it is the "LIKE" clause that filters an output from the SHOW database by referencing a particular pattern. The basic syntax is:

SHOW DATABASES TYPES LIKE"'

The string must be that represents the pattern you wish to match. The end of the string has to include the symbol for percentage, %, that is a reference to at least one character.

In this case, you only want to display those databases that begin with the letter W You can accomplish this by using these commands:

SHOW DASHBOARDS SUCH AS "w%'

Here's the filtering result:

Utilizing the Information Schema to query Table Metadata

Earlier, you saw how you could see how the information_schema database is where you can store all information related to databases, tables, as well as other items in the MySQL server.

The information_schema database utilizes the schemata table to store the information for all databases. For filtering the databases you have to use an extensive search that queries the schema table specifically for databases.

If, for instance, you're searching for databases with names that begin with "samp" or "word," you can mix several clauses together to create a more complex searching:

SELECT schema_name FROM information_schema.schemata WHERE schema_name LIKE 'samp%' OR schema_name LIKE 'word%';

This is the result:

Additionally, there is an one more table, called"the table table within the information_schema database. This table provides information about the tables. In addition, you can run queries to search for tables that meet specific patterns.

SELECT * FROM information_schema.tables WHERE table_name LIKE 'wp_%';

This is the result:

Other tables found in information_schema include columns, constraints, table_constraints, check_constraints, and referential_constraints.

The Most Common Problems and Methods to Solve It.

One of the main reasons for errors while executing SQL is the inability of utilize the semicolon after the statements.

Another issue could be using an incorrect SQL syntax or incorrectly written name for a table or column. In order to avoid this issue, check the name of the column table to make sure you've got it correctly written. Check your spelling as well.

Here are some more tips to be aware of in your mind.

Make use of uppercase characters when writing SQL Keywords

If you are writing SQL code, you should always make use of uppercase when writing SQL keywords and lowercase for columns and table names. The code is more understandable and is less prone to error.

Instead of:

select * from information_schema.tables where table_name like 'wp_%';

Try this:

SELECT * FROM information_schema.tables WHERE table_name LIKE 'wp_%';

Avoid Using SELECT *

Avoid using SELECT * in your SQL queries. It's not clear since it's not feasible to determine exactly what the query will generate. Be sure to indicate the columns you wish to select in the tableau.

In lieu of:

SECT * EXCEPT(phone) from users.profile

Take these steps:

SELECT name, dob, address, country, address, FROM user.profile

You are able to enter the code of your Code

Another tip to make finding mistakes easier is to mark your code. This makes your code more easily accessible!

Database Managers

It is also possible to manage your database without needing to write SQL using your database administrator. It allows users to access database management functions without needing to create SQL queries. This program connects directly to MySQL server, and offers the user with an interface to use the functions of the database. After connecting it will open the user interface. UI will show all databases available on the server. The design and style of the UI differ among managing tools, but the procedure is the same.

Summary

As a server administrator you'll need to quickly and efficiently get information from the databases that are on your MySQL server. Being able to recognize which databases are on the server, access specific tables and the information contained in them, as well as gain access to details about roles of users and privileges are all essential tasks. It is good to know that using SQL using the command line makes it easy.

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