WordPress database is easy to use with simple, but if you want to handle the data that does not conform to the provided initial table structure, or considering the use of as the CMS, you should create a newly table as a better case.
This plugin provides the ability to be able to add a new table freely in the database (direct on MySQL) of WordPress in such a case, and can be management of data in a simple user interface. However, since the plugin version 2.x, you need to be PHP version 5.4 or more on the environment.
When you use the various shortcodes, built-in methods, and APIs that is provided a rich on this plugin, WordPress might be transformed into a powerful CMS.
<a href="https://ka2.org/cdbt/" rel="nofollow ugc">Please see here for more documentation of the plugin</a>. 
All official development on this plugin is on GitHub. Published version will bump here on WordPress.org. You can find the repository at <a href="https://github.com/ka215/cdbt" rel="nofollow ugc">https://github.com/ka215/cdbt</a>.
Detailed documentation has published at the site of author. If you are free, Please try to qv.
<ul>
<li><a href="https://ka2.org/cdbt/v2/" rel="nofollow ugc">Version 2.x related documentation</a></li>
<li><a href="https://ka2.org/cdbt/v1/" rel="nofollow ugc">Version 1.x related documentation</a></li>
</ul>
(Sorry, for about documentation will be only the Japanese version currently.)

Custom DataBase Tables

Hi,
I am using Custom DataBase Tables plugin to create custom tables in database. Its really great. I need to create a password field which needs to be md5 encrypted. how can we do that in this plugin.

password field in table

Using this database management tool, You can create freely own table in  MySQL database, and do input and output of data in an intuitive operation.

Ivan Komlev

Unlock Custom Data Structures and Dynamic Layouts with Custom Tables
Take your WordPress site to the next level with Custom Tables, a powerful plugin that lets you create custom database tables, fields, and layouts. With its versatility and flexibility, you can build anything from catalogs to edit forms, detail pages, and more.
Demo: <a href="https://tastewp.org/plugins/customtables/" rel="nofollow ugc">Try Custom Tables in action</a> (right-click to open in a new tab)
Key Features:
Twig Template Language Support: Create dynamic layouts with ease using the modern Twig template language. 
31 Field Types: Choose from Integer, Decimal, Text String, Date, Email, Color, Image, and more to create complex data structures. 
Layout Editor: Simplify layout creation with the Auto-Create button, which generates a layout based on your table fields. 
Secure and Sanitized: All tables are stored in MySQL, with queries and field values properly sanitized for added security.
<h4>Introduction</h4>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/Dq3jbk9JaJY?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe> 
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/qehcUdr7vk0?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h4>More information</h4>
Visit <a href="https://ct4.us/" rel="nofollow ugc">ct4.us</a> for more information, take a look at <a href="https://github.com/joomlaboat/custom-tables/wiki" rel="nofollow ugc">wiki</a>.

CustomTables – Create, Read, Update, and Delete

The Custom Tables plugin allows you to create and manage custom database tables, display catalogs, forms, and tables using Twig templating language.

Custom DataBase Tables vs CustomTables – Create, Read, Update, and Delete