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Database interactions with WP_Query and $wpdb
Presentation I gave at WordCamp Asheville in 2015. In which I provide an overview of two different PHP classes for querying the WordPress database: $wpdb for custom queries, and WP_Query() for getting lists of posts.
This plugin provides a user interface for creating WordPress queries (WP_Query), and determining how they will appear. Each query is available as a WordPress widget and a shortcode for easy implementation.