添加一个SQL查询的结果的另一个查询

我现在不很了解SQL查询，我有一个问题添加一个SQL查询的结果的另一个查询

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

此查询给我的结果一样

现在我想使用该结果在其他查询，如何做到这一点，我需要创建循环或有任何其他方式

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

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2012-10-15 sHa Xahid

你不能在开发代码中做到这一点，或者你必须使用SQL吗？你有没有在MySQL的功能？ –

好的，但如何在SQL中做到这一点 –

试试这个：

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

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2012-10-15 11:56:10

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

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2012-10-15 11:56:05 jainvikram444

试试这个：

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)

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2012-10-15 11:57:48 Gidil

JOIN三个表Images，Persons和Regions代替这些IN S和子查询：

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

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2012-10-15 11:59:20

有几种方法你可以做到这一点。您可以像使用IN示例一样使用IN示例，但只有当您只需要一列时才能正常工作（我知道这是您的情况，但如果您遇到需要更多信息的情况，这oncolumn）

的simples将包裹查询到parentesys，并给它一个别名，所以你可以使用它一样，如果它是一个表：

(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

然后哟天亚社与其他查询加盟。但这通常不是一个好方法。

最好apporach，其使用通用表表达式（CTE的），所以你会做这样的事情：

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

和你加入它问心无愧任何你需要

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2012-10-15 12:08:44 Diego

只需添加并向第一个谓词并指定另一个谓词。

SELECT PERSON_REF FROM IMAGES WHERE PERSON_REF IN（SELECT _PERSON_ID 向个人 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

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2012-10-16 18:35:40 Farfarak

添加一个SQL查询的结果的另一个查询

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