MySQL獨特條目無視ORDER_BY後的所有重複

Question

我想要創建一個查詢來創建一個計算的字段ANSWER_SCORE，然後它將查詢的結果排序。我也想選擇其他兩個字段QUESTION_ID和ANSWER_ID。

我只想選擇不同的QUESTION_ID。不過，我也想選擇與該QUESTION_ID（這將是共用的，它返回QUESTION_ID我不確定如何做到這一點的所有查詢的一些其他信息

這裏是我的查詢：。

SELECT QUESTION_ID, 
     ANSWER_ID, 
     sum(ANSWER_SCORE) AS ANSWER_SCORE_SUMMED 
FROM(SELECT 
     nc.PARENT_COMMUNICATIONS_ID AS QUESTION_ID, 
     cr.COMMUNICATIONS_ID AS ANSWER_ID, 
     case when cr.CONSUMER_ID= nc.SENDER_CONSUMER_ID then 2*(1 - EXP(-0.5 * (cal.REAL_TIPS_AMOUNT/ATV.AVG_TIPS) + .15))*(24/(((UNIX_TIMESTAMP(NOW())-UNIX_TIMESTAMP(cal.LAST_MOD_TIME)+3600)/3600)))*(IFNULL(ces.EXPERT_SCORE,2) * IFNULL(cirm.CONSUMER_RATING,2) + (12.5 * IFNULL((bit_count((conv(scr_tip.survey_string, 2, 10) & conv(scr_view.survey_string, 2, 10)) | ((0xFFFFFFFF>>(32-6))&~(conv(scr_tip.survey_string, 2, 10)|conv(scr_view.survey_string, 2, 10))))/6),.3))) 
      else (1 - EXP(-0.5 * (cal.REAL_TIPS_AMOUNT/ATV.AVG_TIPS) + .15))*(24/(((UNIX_TIMESTAMP(NOW())-UNIX_TIMESTAMP(cal.LAST_MOD_TIME)+3600)/3600)))*(IFNULL(ces.EXPERT_SCORE,2) * IFNULL(cirm.CONSUMER_RATING,2) + (12.5 * IFNULL((bit_count((conv(scr_tip.survey_string, 2, 10) & conv(scr_view.survey_string, 2, 10)) | ((0xFFFFFFFF>>(32-6))&~(conv(scr_tip.survey_string, 2, 10)|conv(scr_view.survey_string, 2, 10))))/6),.3))) 
     end as ANSWER_SCORE 
    FROM (SELECT 232 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 network_communications AS nc1 
    ON nc.PARENT_COMMUNICATIONS_ID=nc1.COMMUNICATIONS_ID 
JOIN (SELECT ACTION_LOG_ID, 
      LAST_MOD_TIME, 
      CONSUMER_ID, 
      SENDER_CONSUMER_ID, 
      sum(tips_amount) AS real_tips_amount 
     FROM consumer_action_log 
     WHERE COMM_TYPE_ID=4 
     GROUP BY COMMUNICATIONS_ID, SENDER_CONSUMER_ID) AS cal 
ON cr.ACTION_LOG_ID=cal.ACTION_LOG_ID 
JOIN communication_interest_mapping AS cim 
    ON nc.PARENT_COMMUNICATIONS_ID=cim.COMMUNICATION_ID 
LEFT JOIN consumer_interest_rating_mapping AS cirm 
    ON cr.CONSUMER_ID=cirm.CONSUMER_ID 
    AND cim.CONSUMER_INTEREST_EXPERT_ID=cirm.CONSUMER_INTEREST_ID 
JOIN network_communications_message AS ncm 
    ON nc.PARENT_COMMUNICATIONS_ID=ncm.COMMUNICATIONS_ID 
LEFT JOIN consumer_expert_score AS ces 
    ON nc.SENDER_CONSUMER_ID=ces.CONSUMER_ID 
    AND cim.CONSUMER_INTEREST_EXPERT_ID=ces.CONSUMER_EXPERT_ID 
LEFT JOIN surveycustomerrelation AS scr_tip 
    ON cal.SENDER_CONSUMER_ID=scr_tip.Cust_ID 
LEFT JOIN surveycustomerrelation AS scr_view 
    ON cr.CONSUMER_ID=scr_view.CUST_ID 
STRAIGHT_JOIN 
    (
     SELECT AVG(cal.TIPS_AMOUNT) AS AVG_TIPS, 
        cal.SENDER_CONSUMER_ID AS CONSUMER_ID 
     FROM CONSUMER_ACTION_LOG AS cal 
     WHERE COMM_TYPE_ID=4 
     GROUP BY cal.SENDER_CONSUMER_ID 
    ) AS ATV 
    ON cal.SENDER_CONSUMER_ID=ATV.CONSUMER_ID 
    ) AS ASM 
GROUP BY ANSWER_ID 
ORDER BY ANSWER_SCORE_SUMMED DESC 
LIMIT 0,20; 

Answer 1

如果您的其他領域確實是每個QUESTION_ID和ANSWER_ID你返回相同的，你可以簡單地將它們添加到您的選擇列表，並把它們在GROUP BY子句。例如

SELECT QUESTION_ID, 
    ANSWER_ID, 
    FOO, 
    BAR, 
    SUM(ANSWER_SCORE) AS ANSWER_SCORE_SUMMED 
FROM... 
<snip> 
...GROUP BY QUESTION_ID, ANSWER_ID, FOO, BAR 

這有檢查的好處你所有關於其他數據的假設對於每個返回的QUESTION_ID都是相同的，因爲不同的組合都將通過它們自己的ANSWER_SCORE_SUMMED爲您進行佈局。