SQL多个子查询的WHERE子句

Question

我有以下表格：

address_components（表）

ADDRESS_ID  STREET_NUMBER   STREET_NAME 
----------------------------------------------------- 
001    1402      Motz 
002    505      31st 
003    4100      Stimmel 

属性（表）

ID    ATTRIBUTE_DEFINITION_ID   VALUE 
---------------------------------------------------------------- 
001    Lot        546 
001    SubDiv       Avondale Spring 
002    Lot        546 
002    SubDiv       Garden 
003    Lot        131 
003    SubDiv       Avondale Spring 

而且下面的SQL语句：

SELECT 
    street_number,street_name 
FROM 
    address_components a, attributes attr 
WHERE 
    a.address_id = attr.id 
    AND EXISTS (SELECT 1 FROM attributes 
       WHERE attr.attribute_definition_id = 'Lot' 
        AND attr.value = '546') 
    AND EXISTS (SELECT 1 FROM attributes 
       WHERE attr.attribute_definition_id = 'SubDiv' 
        AND attr.value = 'Avondale spring') 

I a m试图选择address_components行“001”，因为我试图检索同时具有“lot = 546”和SubDiv = Avondale Spring“属性条目的行。不是，但两个属性都必须存在。

查询返回无匹配;但是，当我使用单个子查询（排除2个子查询中的1个）查询时，所请求的行将针对该单个查询返回。

Answer 1

SELECT top 1 a.street_number,a.street_name from address_components a 
       inner join attributes k on a.ADDRESS_ID=k.ID 
       WHERE k.ATTRIBUTE_DEFINITION_ID in('Lot','SubDiv') AND 
       k.value in('546','Avondale Spring') 

Answer 2

查询背后的想法很好。但是您不需要from子句中的两个表;你想相关子查询：

SELECT a.street_number, a.street_name 
FROM address_components a 
WHERE EXISTS (SELECT 1 
       FROM attributes attr 
       WHERE a.address_id = attr.id AND attr.attribute_definition_id = 'Lot' AND attr.value = '546' 
      ) AND 
     EXISTS (SELECT 1 
       FROM attributes attr 
       WHERE a.address_id = attr.id AND attr.attribute_definition_id = 'SubDiv' AND attr.value = 'Avondale spring' 
      );