https://codex.wordpress.org/Class_Reference/wpdb
https://codex.wordpress.org/Function_Reference/wpdb_Class
http://www.stevendobbelaere.be/running-database-queries-in-wordpress/
https://wordpress.stackexchange.com/questions/131687/how-to-return-number-of-found-rows-from-select-query
https://wordpress.stackexchange.com/questions/170549/how-to-count-number-of-records-found-in-a-database-table
http://stackoverflow.com/questions/969932/how-do-i-make-custom-query-with-wordpress
https://onextrapixel.com/13-useful-wordpress-sql-queries-you-wish-you-knew-earlier/
https://en-au.wordpress.org/plugins/wpdatatables/
https://wpdatatables.com/blog/
https://code.tutsplus.com/tutorials/writing-custom-queries-in-wordpress–wp-25510
https://isabelcastillo.com/mysql-wordpress-http-to-https
https://premium.wpmudev.org/projects/category/plugins/
https://speckyboy.com/wordpress-sql-query-snippets/
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