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        字段名称相同时的 SQL 连接

        SQL join when a field name is the same(字段名称相同时的 SQL 连接)
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                  本文介绍了字段名称相同时的 SQL 连接的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我在节点和 url_alias 中都有字段语言".当我进行转储时,第二个语言"变量会覆盖第一个.如何识别这两个变量?

                  I have field "language" in both node and url_alias. When I do a dump, the second "language" variable overwrites the first one. How can I identify both variables?

                  $string =   "SELECT * FROM {node} as node " .
                              " LEFT JOIN {url_alias} as url " .
                              " ON url.src = CONCAT('node/', node.nid) " .                
                              " ORDER BY node.type , node.nid " ;
                  
                  $result= db_query($string);
                  while ($row = db_fetch_object($result)){
                  echo $row->language;
                  var_dump($row);
                  

                  推荐答案

                  SELECT 子句中明确指定列名,而不是使用 *,并给出任何重复的列命名别名.例如,

                  Specify the column names explicitly in your SELECT clause rather than using *, and give any duplicate column names an alias. E.g.,

                  SELECT node.nid,
                      node.language as NodeLanguage,
                      url.language as UrlLanguage
                  FROM {node} as node 
                  LEFT JOIN {url_alias} as url  
                  ON url.src = CONCAT('node/', node.nid)                 
                  ORDER BY node.type , node.nid
                  

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