mysql - 在 ColdFusion 查询中连接表

Question

我正在执行两个查询以从同一数据库中的两个表中的数据构建一个表。我现在拥有的代码如下，但我知道这样做会造成不必要的负载。我一直在尝试加入表格以获得相同的结果，但没有运气。有输入吗？

<cfquery name="GetWeekends">
   SELECT id, weekend_type, community_id, start_date, end_date, language
   FROM _weekends
   WHERE weekend_type = 1 and start_date > Now()
   ORDER BY start_date ASC
</cfquery>  

<cfloop query="GetWeekends">                
    <cfquery name="GetCommunity">
        SELECT community_id, location, language, state, country
        FROM _communities
        WHERE community_id = #getweekends.community_id#
    </cfquery>                  
    <tr>
        <td>#DateFormat(start_date, "mm/dd/yyyy")#</td>
        <td>#GetComm.location#</td>
        <td>#GetComm.state#</td>
        <td>#GetComm.country#</td>
        <td>#GetComm.language#</td>
   </tr>
</cfloop>

Answer 1

数据库连接非常基础。你最好对它们进行自我教育。

无论如何，看起来你想做这样的事情：

<cfquery name="GetWeekends">
SELECT w.id, w.weekend_type, w.community_id, w.start_date, w.end_date,
  w.language,
  c.community_id, c.location, c.language, c.state, c.country
FROM _weekends w
  INNER JOIN _communities c
    ON w.community_id=c.community_id
WHERE w.weekend_type = 1 and w.start_date > Now()
ORDER BY w.start_date ASC
</cfquery>