Question

在尝试使用PHP和MySQL中的不同条件加入多个表时，我收到以下错误。

UNION和ORDER BY的使用不正确

这是我的问题：

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如何解决此错误？

Answer 1

您应该仅在查询结尾处分配订单，而不是在每个选择中并为不同表中具有相同名称的列使用适当的别名

select 
     b.member_id as b_member_id
    ,b.rest_name
    ,b.city
    ,b.proviance
    ,b.postal
    ,b.address
    ,b.country
    ,b.person
    ,b.mobile
    ,b.url
    ,b.status
    ,b.premium
    ,b.image
    ,b.business_phone_no
    ,b.email
    ,b.multiple_image
    ,b.latitude
    ,b.longitude
    ,b.quadrant
    ,d.member_id as d_member_id
    ,d.day_id
    ,d.cat_id
    ,d.subcat_id
    ,d.comment
    ,d.city
    ,d.special_images
    ,c.cat_id
    ,c.special
    ,sub.subcat_id
    ,sub.subcat_name
    ,sub.status
    ,sl.day_id
    ,sl.member_id
    ,sl.date_from
    ,sl.date_to 
from db_restaurant_basic as b 
left join db_restaurant_detail as d on b.b_member_id=d.d_member_id 
left join db_category as c on d.cat_id=c.cat_id 
left join db_subcategory as sub on d.subcat_id=sub.subcat_id 
left join db_special_images as sl on d.day_id=sl.day_id and d.member_id=sl.member_id 
where b.city='2' 
  and d.day_id='3' 
  and c.special='2' 
  and sl.date_from <='2016-10-26' 
  and sl.date_to >= '2016-10-26' 
  and b.status=1 
  and sub.status=1 
  and sl.date_from !='' 
  and sl.date_to !='' 

UNION ALL 

SELECT 
     b.member_id
    ,b.rest_name
    ,b.city
    ,b.proviance
    ,b.postal
    ,b.address
    ,b.country
    ,b.person
    ,b.mobile
    ,b.url
    ,b.status
    ,b.premium
    ,b.image
    ,b.business_phone_no
    ,b.email
    ,b.multiple_image
    ,b.latitude
    ,b.longitude
    ,b.quadrant
    ,d.member_id
    ,d.day_id
    ,d.cat_id
    ,d.subcat_id
    ,d.comment
    ,d.city
    ,d.special_images
    ,c.cat_id
    ,c.special
    ,sub.subcat_id
    ,sub.subcat_name
    ,sub.status
    ,sl.day_id
    ,sl.member_id
    ,sl.date_from
    ,sl.date_to 
from db_restaurant_basic as b 
left join db_restaurant_detail as d on b.member_id=d.member_id 
left join db_category as c on d.cat_id=c.cat_id 
left join db_subcategory as sub on d.subcat_id=sub.subcat_id 
left join db_special_images as sl on d.day_id=sl.day_id and d.member_id=sl.member_id 
where b.city='2' 
  and d.day_id='3' 
  and c.special='2' 
  and b.status=1 
  and sub.status=1 a
  nd sl.date_from ='' 
  and sl.date_to ='' 
ORDER BY b_member_id DESC

使用PHP和MySQL加入多表时出现SQL错误

1 个答案: