ays在suppliers表中链接了0或1条记录，因此无需在此处分组。B） 当没有供应商数据时，可以将其设置为NULL。C） 搜索函数检索帖子，当用户搜索某些内容时，mysql查询变得更大。e、 g.在供应商上筛选帖子/在类别上筛选帖子等。这就是为什么我认

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ays在suppliers表中链接了0或1条记录，因此无需在此处分组。B） 当没有供应商数据时，可以将其设置为NULL。C） 搜索函数检索帖子，当用户搜索某些内容时，mysql查询变得更大。e、 g.在供应商上筛选帖子/在类别上筛选帖子等。这就是为什么我认为我需要从

wp_posts

表开始。我之所以选择GroupBy，是因为我需要能够根据类别进行过滤。只要我无法找到更好的方法来过滤类别，我就需要使用

GROUP\u CONCAT

+

来过滤我的帖子。我的问题在这里描述：
wp\u teleapo\u供应商
确实没有主键。我现在将它添加到
ID
列！亲爱的里克，问题在于分组和排序是不同的列。我更新了我的问题，你能再看一眼吗？你链接的另一个问题似乎不一样，而且可能可以很干净地解决。我提供了一个答案。我不明白这和这个问题有什么关系。
SELECT
    wpp.ID, wpp.post_title, wpp.post_author,
    wpp.post_status, s.supplier_company
FROM wp_posts AS wpp 
LEFT JOIN wp_postmeta AS postmeta ON wpp.ID = postmeta.post_id 
LEFT JOIN wp_term_relationships AS term_link ON wpp.ID = term_link.object_id 
LEFT JOIN wp_terms AS terms ON term_link.term_taxonomy_id = terms.term_id 
LEFT JOIN wp_teleapo_supplier AS s ON wpp.post_author = s.ID 
WHERE wpp.post_type = 'post'
AND wpp.post_warning <> 'no_image'
AND wpp.post_status <> 'trash'
AND wpp.post_status <> 'auto-draft'
GROUP BY wpp.ID 
ORDER BY post_date DESC 
LIMIT 100 OFFSET 0

GROUP BY wpp.ID 
ORDER BY post_date DESC 

GROUP BY wpp.ID 
ORDER BY wpp.ID DESC 

id  select_type table   type    possible_keys   key key_len ref rows    Extra
1   SIMPLE  wpp ref type_status_date,post_type,post_status  post_type   62  const   3351    Using where; Using temporary; Using filesort
1   SIMPLE  postmeta    ref post_id post_id 8   r_11524_jtc.wpp.ID  7   Using index
1   SIMPLE  term_link   ref PRIMARY PRIMARY 8   r_11524_jtc.wpp.ID  92  Using index
1   SIMPLE  terms   eq_ref  PRIMARY PRIMARY 8   r_11524_jtc.term_link.term_taxonomy_id  1   Using index
1   SIMPLE  s   eq_ref  ID  ID  4   r_11524_jtc.wpp.post_author 1   

SELECT  SQL_CALC_FOUND_ROWS wpp.ID, wpp.post_title, wpp.post_author,
        wpp.post_status, s.supplier_company,
        GROUP_CONCAT(DISTINCT terms.slug SEPARATOR ',') AS allslug,
        GROUP_CONCAT(DISTINCT terms.name SEPARATOR ',') AS allcatname
    FROM  wp_posts AS wpp
    LEFT JOIN  wp_postmeta AS postmeta ON wpp.ID = postmeta.post_id
    LEFT JOIN  wp_term_relationships AS term_link ON wpp.ID = term_link.object_id
    LEFT JOIN  wp_terms AS terms ON term_link.term_taxonomy_id = terms.term_id
    LEFT JOIN  wp_teleapo_supplier AS s ON wpp.post_author = s.ID
    WHERE  wpp.post_type = 'post'
      AND  wpp.post_warning <> 'no_image'
      AND  wpp.post_status <> 'trash'
      AND  wpp.post_status <> 'auto-draft' /* All search on post_title
      and  any postmeta value */
      AND  (post_title LIKE '%textile%'
        OR  postmeta.meta_value LIKE '%textile%')
              /* extra filters. The one below is an example of a filter on
                 the user #324 but this field can also take the username
                 (supplier_company) parameters etc. */
      AND  ( wpp.post_author LIKE '%324%'
              OR  ( EXISTS 
                      ( SELECT  1
                            FROM  wp_teleapo_supplier as s2
                            WHERE  s2.ID = wpp.post_author
                              AND  (s2.supplier_company      LIKE '%324%'
                                OR  s2.supplier_company_kana LIKE '%324%') ) )
              OR  ( EXISTS 
                      ( SELECT  1
                            FROM  wp_postmeta AS postmeta2
                            WHERE  postmeta2.post_id = wpp.ID
                              AND  postmeta2.meta_key = 'input_comp'
                              AND  postmeta2.meta_value LIKE '%324%' ) ) )
    GROUP BY  wpp.ID /* Filter on Categories!! */
    HAVING  ( allcatname LIKE '%apparel-and-accessories%'
             OR  allslug LIKE '%apparel-and-accessories%' )
    ORDER BY  post_date DESC
    LIMIT  20 OFFSET 0