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JOIN Two Tables in WordPress Tom McFarlin

    https://tommcfarlin.com/join-two-tables-in-wordpress/
    Nov 13, 2015 · A `JOIN` is a way to retrieve records from at least two tables. For example, in WordPress, let’s say we wanted to pull back all information for a single post. This would include information from the posts table as well as the postmeta table. To do this, we’d write a query to would JOIN the two tables based on, say, a given post ID.

php - Wordpress combine queries - Stack Overflow

    https://stackoverflow.com/questions/23555109/wordpress-combine-queries
    We extend the WP_Query class to achieve our goal. We actually do that twice: WP_Query_Empty: to get the generated SQL query of each sub-queries, but without doing the database query. WP_Query_Combine: to fetch the posts. The following implementation supports combining N sub-queries. Here are two demos: Demo #1:

mysql - Wordpress users and usermeta - joining multiple ...

    https://stackoverflow.com/questions/10730873/wordpress-users-and-usermeta-joining-multiple-rows-in-one-table-to-one-row-in
    select u1.id, u1.login, u1.password, u1.email from wp_users u1. The query I have for getting the meta as a row this is: select m1.user_id, m1.meta_value as firstname, m2.meta_value as lastname, m3.meta_value as country from wp_usermeta m1 join wp_usermeta m2 on (m1.user_id = m2.user_id and m2.meta_key = 'last_name') join wp_usermeta m3 on …

WP_Meta_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_meta_query/
    'join' => string ' INNER JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id INNER JOIN wp_postmeta AS mt1 ON (wp_posts.ID = mt1.post_id)' Use that in further queries or form inside your posts_clauses, posts_where or posts_join filter callbacks.

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.
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