SQL聯合查詢不返回這兩列

我想從特定格式的數據庫檢索數據以掛鉤到儀表板應用程序。我需要一個名爲「導入」的列，其中包含數字，另一列叫做「導出」，其中包含相關計數。我現在有下面的查詢，但它只返回一個導入列，我已驗證有相關數據顯示爲導出。有任何想法嗎？添加我得到的結果截圖...SQL聯合查詢不返回這兩列

SELECT count(*) as "Import", a.ship_id "Ship" 
    FROM SERVICE_EVENTS a JOIN CONTAINERS b ON a.eq_nbr = b.nbr 
WHERE (
     (to_char(sysdate, 'HH24') between '07' and '17' and a.performed between trunc(sysdate) + 7/24 and sysdate and category = 'I') 
     OR 
     (to_char(sysdate, 'HH24') between '18' and '23' and a.performed between trunc(sysdate) + 18/24 and sysdate and category = 'I') 
     OR 
     (to_char(sysdate, 'HH24') between '00' and '06' and a.performed between trunc(sysdate - 1) + 18/24 and sysdate and category = 'I') 
     ) 
     AND a.TSERV_ID in ('LOAD', 'DISCHARGE') group by a.ship_id 
UNION 
SELECT count(*) as "Export", a.ship_id "Ship" 
    FROM SERVICE_EVENTS a JOIN CONTAINERS b ON a.eq_nbr = b.nbr 
WHERE (
     (to_char(sysdate, 'HH24') between '07' and '17' and a.performed between trunc(sysdate) + 7/24 and sysdate and category = 'E') 
     OR 
     (to_char(sysdate, 'HH24') between '18' and '23' and a.performed between trunc(sysdate) + 18/24 and sysdate and category = 'E') 
     OR 
     (to_char(sysdate, 'HH24') between '00' and '06' and a.performed between trunc(sysdate - 1) + 18/24 and sysdate and category = 'E') 
     ) 
     AND a.TSERV_ID in ('LOAD', 'DISCHARGE') group by a.ship_id 

;

來源

2015-11-04 runelynx

什麼是您預期的結果？ –

UNION不會將額外的數據添加爲列（向右），它會將額外的行添加到結果中（在現有列中）。您可以通過添加另一列「type」來區分這兩個列（否則可能很難區分它們），或者做一些更復雜的事情，比如@vkp在他的回答中做的事情。 – Thilo

@AaronBertrand固定 – runelynx

你可以做一個有條件的聚集和簡化查詢到這一點：

SELECT 
    a.ship_id AS Ship, 
    COUNT(CASE WHEN category = 'I' THEN 1 END) AS Import, 
    COUNT(CASE WHEN category = 'E' THEN 1 END) AS Export 
FROM SERVICE_EVENTS a 
JOIN CONTAINERS b 
    ON a.eq_nbr = b.nbr 
WHERE 
    (
     (to_char(sysdate, 'HH24') BETWEEN '07' AND '17' AND a.performed BETWEEN trunc(sysdate) + 7/24 AND sysdate)  
     OR (to_char(sysdate, 'HH24') BETWEEN '18' AND '23' AND a.performed BETWEEN trunc(sysdate) + 18/24 AND sysdate) 
     OR (to_char(sysdate, 'HH24') BETWEEN '00' AND '06' AND a.performed BETWEEN trunc(sysdate - 1) + 18/24 AND sysdate) 
    ) 
    AND a.TSERV_ID in ('LOAD', 'DISCHARGE') 
GROUP BY a.ship_id

來源

2015-11-04 23:55:27

謝謝你，作品像一個魅力，看起來非常乾淨。 – runelynx

@runelynx我做了一個編輯，確保再次進行測試。 –

謝謝，抓住了......第一次運行強迫類別爲'E':-)將通過雖然運行你的新版本。 – runelynx

您可以明確選擇null不被計算在列，並完成一個更加聚集。

select max(Import) as Import, max(Export) as Export, Ship 
from ( 
SELECT count(*) as "Import", null as "Export", a.ship_id "Ship" 
    FROM SERVICE_EVENTS a JOIN CONTAINERS b ON a.eq_nbr = b.nbr 
WHERE (
     (to_char(sysdate, 'HH24') between '07' and '17' and a.performed between trunc(sysdate) + 7/24 and sysdate and category = 'I') 
     OR 
     (to_char(sysdate, 'HH24') between '18' and '23' and a.performed between trunc(sysdate) + 18/24 and sysdate and category = 'I') 
     OR 
     (to_char(sysdate, 'HH24') between '00' and '06' and a.performed between trunc(sysdate - 1) + 18/24 and sysdate and category = 'I') 
     ) 
     AND a.TSERV_ID in ('LOAD', 'DISCHARGE') group by a.ship_id 
UNION 
SELECT null as import, count(*) as "Export", a.ship_id "Ship" 
    FROM SERVICE_EVENTS a JOIN CONTAINERS b ON a.eq_nbr = b.nbr 
WHERE (
     (to_char(sysdate, 'HH24') between '07' and '17' and a.performed between trunc(sysdate) + 7/24 and sysdate and category = 'E') 
     OR 
     (to_char(sysdate, 'HH24') between '18' and '23' and a.performed between trunc(sysdate) + 18/24 and sysdate and category = 'E') 
     OR 
     (to_char(sysdate, 'HH24') between '00' and '06' and a.performed between trunc(sysdate - 1) + 18/24 and sysdate and category = 'E') 
     ) 
     AND a.TSERV_ID in ('LOAD', 'DISCHARGE') group by a.ship_id 
) t 
group by Ship

來源

2015-11-04 23:52:44

SQL聯合查詢不返回這兩列

回答

相關問題