Question

我正在使用以下联合查询与左连接查询

    (SELECT id as hotspots_id,location as town,gmlat,gmlng,street,country,zipcode as 

plz,name,description ,c.id as cat_id ,c.* FROM `jos_skopelos_pages_list` LEFT JOIN 

    `jos_skopelos_listcategories` AS c ON jos_skopelos_pages_list.type=cat_id WHERE 

published = 1) UNION ALL (SELECT id as hotspots_id,location as 

town,gmlat,gmlng,street,country,zipcode as plz,name,description ,c.id as cat_id ,c.* FROM 

`jos_skopelos_accomodation` LEFT JOIN `jos_skopelos_listcategories` AS c ON 

 jos_skopelos_accomodation.type=cat_id WHERE published = 1) UNION ALL (SELECT id as 

 hotspots_id,location as town,gmlat,gmlng,street,country,zipcode as plz,name,description 
,c.id as cat_id ,c.* FROM `jos_skopelos_entertainment` LEFT JOIN 

`jos_skopelos_listcategories` AS c ON jos_skopelos_entertainment.type=cat_id WHERE 

published = 1) UNION ALL (SELECT id as hotspots_id,location as 

  town,gmlat,gmlng,street,country,zipcode as plz,name,description ,c.id as cat_id ,c.* 

FROM `jos_skopelos_realstate` LEFT JOIN `jos_skopelos_listcategories` AS c ON 

 jos_skopelos_realstate.type=cat_id WHERE published = 1)

上面的查询是带有union语句的工作文件但是当我添加左连接语句时，它给出错误“＃1052 - 字段列表中的列'id'是不明确的。”请记住当我删除左连接时表“jos_skopelos_listcategories”我的查询工作正常，但当我添加左连接语句时，它给出了上述错误请帮助

Answer 1

我认为对于所有这些人，您需要更清楚地定义列，特别是因为id位于您要连接在一起的两个表中。例如，第一行更改，id为jos_skopelos_pages_list.id。在最后一节中，将id更改为jos_skopelos_realstate.id以及中间的所有联合。另外，当您说LEFT JOIN jos_skopelos_listcategories AS c时，您只需撰写LEFT JOIN jos_skopelos_listcategories c

即可

加入联盟不在mysql中工作

1 个答案: