將一個SQL查詢的結果添加到另一個查詢

Question

我現在不太關於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 

這個查詢給出了我的結果

2  
4  
5  
6  

現在我想在其他查詢中使用該結果，如何做到這一點，我需要創建循環還是有其他方法

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

Answer 1

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 2

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 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而不是這些IN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

有幾種方法可以做到這一點。 您可以使用IN示例，因為它已經是無法使用但只有在您只需要一列時才會起作用（我知道，這是您的情況，但如果您遇到需要更多的情況，最好知道可以做什么oncolumn）

簡單的方法是將你的查詢包裝到parentesys並給它一個別名，這樣你就可以像使用它一樣使用它：

(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

然后你可以加入你的其他查詢。 這通常不是一個好方法。

最好的apporach，它使用公用表表達式（CTE），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  

無論你需要什么，你就加入它吧

Answer 6

只需將AND添加到第一個謂詞並指定另一個謂詞。

從PAGES_REF輸入的圖像中選擇PERSON_REF（從REGERS_REF =（從REGIONSAB =“EU”的區域選擇_REGION_ID）選擇_PERSON_ID）和EFFECT_REF = 2具有計數的PERSON_REF組（PERSON_REF）> = 3