在JOINED MySQL查詢中過濾MAX（）函數

Question

解決：這是解決方案代碼。

//Extend Category queries to support "latest_post" for orderby parameter
function filter_term_sort_by_latest_post_clauses( $pieces, $taxonomies, $args )
{
    global $wpdb;
    if ( in_array('category', $taxonomies) && $args['orderby'] == 'latest_post' )
    {
        $pieces['fields'] .= ", MAX(p.post_date) AS last_date";
        $pieces['join'] .= " JOIN $wpdb->term_relationships AS tr JOIN $wpdb->posts AS p ON p.ID=tr.object_id AND tr.term_taxonomy_id=tt.term_taxonomy_id";
        $pieces['where'] .= " AND p.post_status='publish' GROUP BY t.term_id";
        $pieces['orderby'] = "ORDER BY last_date";
        $pieces['order'] = "DESC"; // DESC or ASC
    }
    return $pieces;
}
add_filter('terms_clauses', 'filter_term_sort_by_latest_post_clauses', 10, 3);

原始問題：

我在WordPress網站中添加了以下功能和篩選器掛鈎，該功能使我可以列出類別，並按每個類別中的最新帖子進行排序。 該功能按預期工作，除了包括草稿職位，並將該特定類別移至列表頂部。

//Extend Category queries to support "latest_post" for orderby parameter
function filter_term_sort_by_latest_post_clauses( $pieces, $taxonomies, $args )
{
    global $wpdb;
    if ( in_array('category', $taxonomies) && $args['orderby'] == 'latest_post' )
    {
        $pieces['fields'] .= ", MAX(p.post_date) AS last_date";
        $pieces['join'] .= " JOIN $wpdb->term_relationships AS tr JOIN $wpdb->posts AS p ON p.ID=tr.object_id AND tr.term_taxonomy_id=tt.term_taxonomy_id";
        $pieces['where'] .= " GROUP BY t.term_id";
        $pieces['orderby'] = "ORDER BY last_date";
        $pieces['order'] = "DESC"; // DESC or ASC
    }
    return $pieces;
}
add_filter('terms_clauses', 'filter_term_sort_by_latest_post_clauses', 10, 3);

我想使select子句“ MAX（p.post_date）AS last_date”僅包含已發布帖子中的值（WHERE p.post_status = publish“）

我該怎么做？

謝謝！

Answer 1

將語句添加到where子句怎么辦：$ pieces ['where']。=“ WHERE p.post_status ='publish'GROUP BY t.term_id”; 。 除非我錯過了一些東西，否則應該很容易解決。 希望這可以幫助。