Question

我有一张名为＆＃39; quote＆＃39;它有以下字段..

category_id
subcategory_id
country_id
region_id
rural_id
notes
sender_uid
receiver_uid 
created_timestamp
is_quote_active

此外，我还有＆＃39;类别＆＃39;，＆＃39;子类别＆＃39;，＆＃39; country＆＃39;，＆＃39; region＆＃39;，＆＃39; rural＆＃39;和＆＃39;用户＆＃39;表。我需要一个SQL查询来检索数据，如下所示..

category_name (from 'category' table)
subcategory_name (from 'subcategory' table)
country_name (from 'country' table)
region_name (from 'region' table)
rural_name (from 'rural' table)
notes 
sender_name (from 'user' table)
receiver_name (from 'user' table)
created_timestamp
is_quote_active

事实上，我需要获取名称而不是ID。我正在寻找最有效的方式..

由于

Answer 1

您需要加入所有这些表格

例如，

SELECT CN.category_name ,SC.subcategory_name ,CO.country_name ,R.region_name ,RE.region_name ,U.sender_name ,U.receiver_name 
From category Left JOIN subcategory ON ...
              Left JOIN country ON..
              Left JOIN region ON..
              Left JOIN rural ON..
              Left JOIN User ON..
Where 'Your condition here'

Answer 2

试试这个，

SELECT  quote.quote_id, quote.notes, quote.is_quote_active, quote.created_timestamp, category.category_name, subcategory.subcategory_name, rural.rural_name, region.region_name, country.country_name, s.name AS sname, r.name AS rname 
  FROM quote
         LEFT JOIN category ON quote.category_id = category.category_id
   LEFT JOIN subcategory ON quote.subcategory_id = subcategory.subcategory_id
   LEFT JOIN country ON quote.country_id = country.country_id
   LEFT JOIN region ON quote.region_id = region.region_id
   LEFT JOIN rural ON quote.rural_id = rural.rural_id
   LEFT JOIN user s ON quote.sender_uid = s.uid 
   LEFT JOIN user r ON quote.receiver_uid = r.uid

我的SQL加入超过5个表

2 个答案: