添加一個SQL查詢的結果的另一個查詢

Question

我現在不很瞭解SQL查詢，我有一個問題

SELECT PERSON_REF 
FROM IMAGES 
WHERE PERSON_REF IN (SELECT _PERSON_ID 
         FROM PERSONS 
         WHERE REGION_REF = (SELECT _REGION_ID 
              FROM REGIONS 
              WHERE REGION_ABB = "EU")) 
GROUP BY PERSON_REF 
HAVING Count(PERSON_REF) >= 3 

此查詢給我的結果一樣

2 
4 
5 
6 

現在我想使用該結果在其他查詢，如何做到這一點，我需要創建循環或有任何其他方式

SELECT PERSON_REF 
FROM IMAGES 
WHERE EFFECT_REF = 2 
     AND PERSON_REF IN (2, 4, 5, 6) 

Answer 1

試試這個：

select Person_Ref from Images where Effect_Ref = 2 and Person_Ref IN 
(your first query which gives 2 4 5 6) 

Answer 2

select Person_Ref from Images where Person_Ref IN ( 
Select _Person_ID from Persons where 
Region_Ref in (select _Region_ID from Regions where Region_Abb = "EU")) 
and EFFECT_REF = 2 
group by Person_Ref HAVING COUNT(Person_Ref) >= 3 

Answer 3

試試這個：

SELECT PERSON_REF 
FROM IMAGES 
WHERE EFFECT_REF = 2 
     AND PERSON_REF IN (SELECT PERSON_REF 
          FROM IMAGES 
          WHERE PERSON_REF IN (SELECT _PERSON_ID 
               FROM PERSONS 
               WHERE 
           REGION_REF = (SELECT _REGION_ID 
               FROM REGIONS 
               WHERE 
           REGION_ABB = "EU")) 
          GROUP BY PERSON_REF 
          HAVING Count(PERSON_REF) >= 3) 

Answer 4

JOIN三個表Images，Persons和Regions代替這些IN S和子查詢：

SELECT i.Person_Ref 
FROM Images i 
INNER JOIN Persons p ON i.Person_Ref = p.Person_Ref 
INNER JOIN Regions r ON p.Region_Ref = r.Region_Ref 
WHERE r.Region_Abb = "EU" 
    AND i.Effect_Ref = 2 
GROUP BY i.Person_Ref 
HAVING COUNT(i.Person_Ref) >= 3 

Answer 5

有幾種方法你可以做到這一點。 您可以像使用IN示例一樣使用IN示例，但只有當您只需要一列時才能正常工作（我知道這是您的情況，但如果您遇到需要更多信息的情況，這oncolumn）

的simples將包裹查詢到parentesys，並給它一個別名，所以你可以使用它一樣，如果它是一個表：

(SELECT PERSON_REF 
FROM IMAGES 
WHERE PERSON_REF IN (SELECT _PERSON_ID 
         FROM PERSONS 
         WHERE REGION_REF = (SELECT _REGION_ID 
              FROM REGIONS 
              WHERE REGION_ABB = "EU")) 
GROUP BY PERSON_REF 
HAVING Count(PERSON_REF) >= 3) MY_ALIAS 

然後喲天亞社與其他查詢加盟。但這通常不是一個好方法。

最好apporach，其使用通用表表達式（CTE的），所以你會做這樣的事情：

with MY_FIRST_QUERY as(
SELECT PERSON_REF 
    FROM IMAGES 
    WHERE PERSON_REF IN (SELECT _PERSON_ID 
          FROM PERSONS 
          WHERE REGION_REF = (SELECT _REGION_ID 
               FROM REGIONS 
               WHERE REGION_ABB = "EU")) 
    GROUP BY PERSON_REF 
    HAVING Count(PERSON_REF) >= 3 
) 
select MY_FIRST_QUERY.PERSON_REF 

和你加入它問心無愧任何你需要

Answer 6

只需添加並向第一個謂詞並指定另一個謂詞。

SELECT PERSON_REF FROM IMAGES WHERE PERSON_REF IN（SELECT _PERSON_ID 向個人 WHERE REGION_REF =（SELECT _REGION_ID FROM REGIONS WHERE REGION_ABB = 「EU」）） AND EFFECT_REF = 2 GROUP BY PERSON_REF HAVING Count（PERSON_REF）> = 3