不会执行的 SQL 查询

Question

我是 SQL 的新手，不知道为什么这段代码无法执行。我知道错误，但我没有得到任何结果。无论我等多久，代码都会继续处理。我知道这个问题可能与我的特定数据库有关，但我想知道是否有任何明显的错误。

此外，如果它与我在数据库中进行的调用有关，那么我将如何进行调试，因为我没有收到任何形式错误？

SELECT cr.COMMUNICATIONS_ID AS ANSWER_ID, cr.CONSUMER_ID as VIEWER_ID, 
       cr.ACTION_LOG_ID, nc.PARENT_COMMUNICATIONS_ID AS QUESTION_ID,
       cirm.CONSUMER_RATING AS VIEWER_INTEREST, 
       cim.CONSUMER_INTEREST_EXPERT_ID AS DOMAIN
FROM (
       SELECT 234 AS CONSUMER_ID, ACTION_LOG_ID, COMMUNICATIONS_ID 
        FROM consumer_action_log 
        WHERE COMM_TYPE_ID=4
      ) AS cr
    JOIN network_communications AS nc ON 
        cr.COMMUNICATIONS_ID=nc.COMMUNICATIONS_ID
    JOIN communication_interest_mapping AS cim ON 
       nc.PARENT_COMMUNICATIONS_ID=cim.COMMUNICATION_ID
    JOIN consumer_interest_rating_mapping AS cirm ON 
       cr.CONSUMER_ID=cirm.CONSUMER_ID AND           
       cim.CONSUMER_INTEREST_EXPERT_ID=cirm.CONSUMER_INTEREST_ID;

Answer 1

子查询中的派生列可能会导致 MySQL 关闭。尝试使用此查询来获得相同的结果

SELECT cr.COMMUNICATIONS_ID AS ANSWER_ID, cirm.CONSUMER_ID as VIEWER_ID, 
       cr.ACTION_LOG_ID, nc.PARENT_COMMUNICATIONS_ID AS QUESTION_ID,
       cirm.CONSUMER_RATING AS VIEWER_INTEREST, 
       cim.CONSUMER_INTEREST_EXPERT_ID AS DOMAIN
FROM (
       SELECT ACTION_LOG_ID, COMMUNICATIONS_ID 
        FROM consumer_action_log 
        WHERE COMM_TYPE_ID=4
      ) AS cr
    JOIN network_communications AS nc ON 
        cr.COMMUNICATIONS_ID=nc.COMMUNICATIONS_ID
    JOIN communication_interest_mapping AS cim ON 
       nc.PARENT_COMMUNICATIONS_ID=cim.COMMUNICATION_ID
    JOIN consumer_interest_rating_mapping AS cirm ON 
       cim.CONSUMER_INTEREST_EXPERT_ID=cirm.CONSUMER_INTEREST_ID
WHERE cirm.CONSUMER_ID = 234