如何使用count（）返回零值

Question

如何返回count（a.thread_id）= 0的行？

SELECT current_date          AS "Import Date", 
     b.container_id          AS "ID", 
     b.name            AS "Container Name", 
     b.creation_ts          AS 
     "Container Creation Date", 
     COUNT(a.thread_id)         AS 
     "Total Number of Un-Replied-To Threads", 
     round(Avg(current_date - (99) - a.creation_ts :: DATE)) AS "Average Age", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) = 1) THEN 
      1 
      ELSE 0 
      END)           AS "1 Day", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) = 2) THEN 
      1 
      ELSE 0 
      END)           AS "2 Day", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) = 3) THEN 
      1 
      ELSE 0 
      END)           AS "3 Day", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) BETWEEN 4 
        AND 6) 
      THEN 1 
      ELSE 0 
      END)           AS "4-6 Days", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) BETWEEN 7 
        AND 10 
       ) 
      THEN 1 
      ELSE 0 
      END)           AS "7-10 Days", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) BETWEEN 11 
        AND 15 
       ) 
      THEN 1 
      ELSE 0 
      END)           AS "11-15 Days", 
     SUM(CASE 
      WHEN ((current_date - (99) - a.creation_ts :: DATE) > 15) 
      THEN 1 
      ELSE 0 
      END)           AS "15+ Days" 
FROM jivedw_message a, 
     jivedw_container b 
WHERE a.thread_id IN (SELECT a.thread_id 
         FROM jivedw_message a 
         GROUP BY a.thread_id 
         HAVING COUNT(a.message_id) = 1) 
     AND a.thread_id NOT IN (SELECT a.thread_id 
           FROM jivedw_message a 
             INNER JOIN jivedw_object 
             ON (jivedw_object.object_id = 
              a.thread_id) 
             INNER JOIN jivedw_activity_agg_user_day 
             ON (
jivedw_activity_agg_user_day.direct_dw_object_id = 
jivedw_object.dw_object_id 
     ) 
WHERE jivedw_activity_agg_user_day.direct_object_type = 
    '1' 
    AND jivedw_activity_agg_user_day.activity_type IN 
     (30, 70) 
) 
AND (a.container_id = b.container_id) 
AND (b.creation_ts > '2009-11-19' :: DATE) 
GROUP BY b.container_id, 
      b.name, 
      b.creation_ts 
ORDER BY b.name; 

Answer 1

點擊谷歌，查找「有」。在這種情況下，having count(a.thread_id) = 0