Question

我必须在where子句中使用两个值来测试从子查询获得的两个值是否相等。由于我正在处理现有应用程序，因此我希望将其保留为子查询。以下是我的查询。

SELECT 
    o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM 
    ORDER o WITH (NOLOCK) 
INNER JOIN  
    PARTY p WITH (NOLOCK) ON o.ORDER_ID = p.PARTY_ID 
INNER JOIN 
    CUSTOMER c WITH (NOLOCK) ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE 
    (o.EMAIL_ADDRESS, c.CUSTOMER_ID) IN (SELECT EMAIL_ADDRESS, CUSTOMER_ID 
                                         FROM CUSTOMER_MASTER 
                                         WHERE insert_date > '01/02/2019')

我面临的问题是where子句中的第一个值o.EMAIL_ADDRESS引发以下错误：

在需要条件的上下文中指定的非布尔类型的表达式

当我在where子句中使用单个值时，它工作正常。

Answer 1

一种方法是使用EXISTS和相关的子查询。

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM ORDER_HEADER oh  WITH (NOLOCK) 
INNER JOIN  PARTY p WITH (NOLOCK) ON o.ORDER_ID = p.PARTY_ID 
INNER JOIN CUSTOMER c WITH (NOLOCK) ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE EXISTS(
    SELECT 1
    FROM CUSTOMER_MASTER AS cm
    WHERE cm.insert_date > '01/02/2019'
    AND o.EMAIL_ADDRESS = cm.EMAIL_ADDRESS
    AND c.CUSTOMER_ID = cm.c.CUSTOMER_ID
    );

Answer 2

in仅允许单列列表。因此，创建单列。

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM ORDER o  WITH (NOLOCK) 
INNER JOIN  PARTY p WITH (NOLOCK) ON o.ORDER_ID = p.PARTY_ID 
INNER JOIN CUSTOMER c WITH (NOLOCK) ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE o.EMAIL_ADDRESS + cast(c.CUSTOMER_ID as varchar) 
IN (select EMAIL_ADDRESS + cast(CUSTOMER_ID as varchar)
from CUSTOMER_MASTER where insert_date > '01/02/2019')

Answer 3

使用EXISTS。我也建议固定日期格式：

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM ORDER o JOIN
     PARTY p 
     ON o.ORDER_ID = p.PARTY_ID JOIN
     CUSTOMER c 
     ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE EXISTS (SELECT 1
              FROM CUSTOMER_MASTER cm
              WHERE cm.EMAIL_ADDRESS = o.EMAIL_ADDRESS AND
                    cm.CUSTOMER_ID = c.CUSTOMER_ID AND
                    cm.insert_date > '2019-02-01'
             );

您的日期常量应采用YYYYMMDD格式。

不过，根据您的逻辑，我认为您不需要所有的JOIN：

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, o.ORDER_ID
FROM ORDER o JOIN
     CUSTOMER c 
     ON o.ORDER_ID = c.CUSTOMER_ID 
WHERE EXISTS (SELECT 1
              FROM CUSTOMER_MASTER cm
              WHERE cm.EMAIL_ADDRESS = o.EMAIL_ADDRESS AND
                    cm.CUSTOMER_ID = c.CUSTOMER_ID AND
                    cm.insert_date > '2019-02-01'
             );

PARTY表似乎没有必要，因为订单可以直接与客户对齐。

如何从子查询中获取两个值，以在sql的where子句中使用

3 个答案: