Method: Filters the query JOIN and WHERE clauses to filter out posts that either do not have a meta key or whose meta value is not in the provided list.

Method: Returns the controlled query request SQL.

Method: Returns the fields, join, where and orderby clauses for an id.

Method: Removes fields, join, where and orderby clauses for an id.

Method: Filter the `posts_orderby` filter to add custom JOIN clauses.

Method: Filter the `posts_fields` filter to amend fields to be selected.

Method: Captures the request SQL as built from the query class.

Method: Creates a SQL interval of strings.

Method: Add a custom ORDER BY to the query.

Method: Add custom select fields to the query.