小编sal*_*usa的帖子

我检查了每个表的排序规则类型,并且它们具有相同的排序规则.

错误:#1271 - 操作'UNION'的非法混合排序

请参阅以下查询:

$query = "(SELECT id, product_name, description, 'tbl_landt' as type FROM                                      tbl_landt WHERE product_name LIKE '%" . 
          $keyword . "%' OR description LIKE '%" . $keyword ."%') 
           UNION
           (SELECT id, name, null, 'tbl_land_cat' as type FROM tbl_land_cat WHERE name LIKE '%" . $keyword . "%') 
           UNION
           (SELECT tbl_sub_cat.id, tbl_sub_cat.name AS cat_name, null, 'tbl_sub_cat' as type FROM tbl_sub_cat WHERE name LIKE '%" . $keyword . "%')
           UNION
           (SELECT id, name, null, 'tbl_exl_cat' as type FROM tbl_exl_cat WHERE …