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Wordpress: SQL query to add or remove categories on ...

    https://www.ryadel.com/en/wordpress-sql-query-to-add-or-remove-categories-on-multiple-posts/
    Feb 29, 2020 · As you probably already know, WordPress does use a relational database model (RDBMS): more specifically, posts and categories are linked together using a many-to-many relationship; this means that each post can be associated with multiple categories and, conversely, each category can be related with multiple posts.

WP_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_query/
    Note: if the query is in a feed, wordpress overwrites this parameter with the stored ‘posts_per_rss’ option. To reimpose the limit, try using the ‘post_limits’ filter, or filter ‘pre_option_posts_per_rss’ and return -1; posts_per_archive_page ...

What is WP_Query in WordPress?

    https://www.wpbeginner.com/glossary/wp_query/
    WP_Query is a class defined in WordPress. It allows developers to write custom queries and display posts using different parameters. It is possible for developers to directly query WordPress database. However, WP_Query is one of the recommended ways to query posts from WordPress database.

WordPress Taxonomy « WordPress Codex

    https://codex.wordpress.org/WordPress_Taxonomy
    WordPress 2.3 first introduced the current taxonomy schema. Any plugin that queries against the old WordPress 2.2 table structure will break horribly; plugins that use the category API should be fine. This new schema replaced the categories, post2cat, and link2cat tables with three new tables that are much more flexible. wp_terms; wp_term_taxonomy

WordPress SQL Queries — Solutions to Common Issues Ben ...

    https://www.benmarshall.me/wordpress-sql-queries/
    Nov 24, 2013 · Your database will grow significantly and will cause an increase in loop iterations, data retrieval and will affect page load times. To help optimize your WordPress database, delete old revisions that you don’t need anymore by using the query below: [code]DELETE a,b,c FROM wp_posts a LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id)

Query Multiple Taxonomies in WordPress - My Blog

    https://wpmods.com/query-multiple-taxonomies-in-wordpress/
    Oct 18, 2019 · wp_term_relationships stores the relationships between terms (category, tag, custom) and an object (mostly posts but can be used for other objects in WordPress – like Users or Comments). To retrieve data from those tables it translates query data and conditions to SQL.
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