Tsql SQL Server：选择查询正在工作，但不选择正在更新的查询。子查询问题

我对更新查询有问题

下面是我试图用来更新另一个名为BOARD_CALLS的表的摘录

表：董事会任务

我使用两条规则：

当至少有一个IS_PHONE/IS_EMAIL/IS_DUPLICATE=1时，则目标表上的IS_PHONE/IS_EMAIL/IS_DUPLICATE=1 其他0

当IS_DUPLICATE_WITH不为空时，我需要用呼叫号码填充IS_DUPLICATE_

当我选择机载任务时，一切正常，结果符合我的要求

结果如下：

SELECT REF_CALL,

MAX(IS_DUPLICATE_WITH) IS_DUPLICATE_WITH,
CASE WHEN COUNT(CASE WHEN IS_PHONE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_PHONE,
CASE WHEN COUNT(CASE WHEN IS_EMAIL = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_EMAIL,
CASE WHEN COUNT(CASE WHEN IS_DUPLICATE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_DUPLICATE

FROM BOARD_TASKS
WHERE IS_DUPLICATE_WITH IS NOT NULL 
OR IS_DUPLICATE = 1
OR IS_DUPLICATE = 0
OR IS_DUPLICATE IS NULL
GROUP BY REF_CALL

表：董事会电话

这里是我使用的select查询：

SELECT REF_CALL,

MAX(IS_DUPLICATE_WITH) IS_DUPLICATE_WITH,
CASE WHEN COUNT(CASE WHEN IS_PHONE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_PHONE,
CASE WHEN COUNT(CASE WHEN IS_EMAIL = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_EMAIL,
CASE WHEN COUNT(CASE WHEN IS_DUPLICATE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_DUPLICATE

FROM BOARD_TASKS
WHERE IS_DUPLICATE_WITH IS NOT NULL 
OR IS_DUPLICATE = 1
OR IS_DUPLICATE = 0
OR IS_DUPLICATE IS NULL
GROUP BY REF_CALL

但当我尝试更新BOARD_呼叫时，我收到了两条错误消息

子查询返回了多个值。当子查询后跟=、！=、时，不允许这样做=

通过聚合或其他集合操作消除空值

这里是我的更新查询

UPDATE T1

SET


T1.IS_DUPLICATE_WITH = (SELECT MAX(IS_DUPLICATE_WITH) 
                        FROM BOARD_TASKS WHERE IS_DUPLICATE_WITH IS NOT NULL 
                        OR IS_DUPLICATE = 1 
                        OR IS_DUPLICATE = 0 
                        OR IS_DUPLICATE IS NULL 
                        GROUP BY REF_CALL),

T1.IS_PHONE = (SELECT 
              (CASE WHEN 
               COUNT(CASE WHEN IS_PHONE = '1' THEN 1 END) > 0 
               THEN 1 ELSE 0 END) 
               FROM BOARD_TASKS 
               GROUP BY REF_CALL),

T1.IS_EMAIL = (SELECT 
              (CASE WHEN 
               COUNT(CASE WHEN IS_EMAIL = '1' THEN 1 END) > 0 
               THEN 1 ELSE 0 END) 
               FROM BOARD_TASKS 
               GROUP BY REF_CALL),

T1.IS_DUPLICATE = (SELECT 
                  (CASE WHEN 
                   COUNT(CASE WHEN BOARD_TASKS.IS_DUPLICATE = '1' THEN 1 END) > 0 
                   THEN 1 ELSE 0 END) 
                   FROM BOARD_TASKS 
                   GROUP BY REF_CALL)

FROM BOARD_CALLS T1
INNER JOIN BOARD_TASKS T2 ON T1.REF_CALL = T2.REF_CALL

BOARD_CALLS在每列上都有默认值

REF_CALL：创建新呼叫时自动填充（主键）

是否为电话/是否为电子邮件/是否为副本：0

是重复的吗？带有：NULL

---

我真的不知道为什么它使用select而不是update（更新）

错误消息非常具体，您试图用一个明显返回多行的查询来更新列。您在文章开头的select语句中显示了这一点。 例如，UPDATE语句的这一部分：

正在尝试将该查询的所有值强制为一个值。这就是优化器试图告诉您的

此外，我不确定的所有可能的值都是重复的，但您似乎列出了所有这些值。如果是这样，那么WHERE子句中不需要它们中的任何一个

试试这个，我没有任何DDL，所以可能会有语法错误，但它应该可以帮助您实现：

UPDATE BOARDCALLS 
    SET IS_DUPLICATE_WITH = t2.IS_DUPLICATE_WITH,
        IS_PHONE = t2.IS_PHONE,
        IS_EMAIL = t2.IS_EMAIL,
        IS_DUPLICATE = t2.IS_DUPLICATE
FROM BOARDCALLS t1
INNER JOIN (
            SELECT REF_CALL,
            MAX(IS_DUPLICATE_WITH) IS_DUPLICATE_WITH,
            CASE WHEN COUNT(CASE WHEN IS_PHONE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_PHONE,
            CASE WHEN COUNT(CASE WHEN IS_EMAIL = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_EMAIL,
            CASE WHEN COUNT(CASE WHEN IS_DUPLICATE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_DUPLICATE

            FROM BOARD_TASKS
            WHERE IS_DUPLICATE_WITH IS NOT NULL 
            OR IS_DUPLICATE = 1
            OR IS_DUPLICATE = 0
            OR IS_DUPLICATE IS NULL
            GROUP BY REF_CALL) t2 ON t1.REF_CALL = t2.REF_CALL

---

旁白：将

int

值与字符串进行比较，例如当IS_PHONE='1'时，将

值与字符串进行比较是一个坏习惯。您好。是的，我不知道我为什么那样做。我已经改正了。谢谢你，工作得很好。子查询的问题已更正。我应该考虑做一个“内部联接”：（。另一条消息“null值被聚合或其他集合操作消除”已更正为。这是因为某些NUM_任务只包含NULL值，而不是1和0。并且is_DUPLICATE的值大于0、1或NULL，因为与此数据库相关的软件上存在错误，正在数据库上写入垃圾数据。无论如何，非常感谢您的帮助。
T1.IS_DUPLICATE_WITH = (SELECT MAX(IS_DUPLICATE_WITH) 
                        FROM BOARD_TASKS WHERE IS_DUPLICATE_WITH IS NOT NULL 
                        OR IS_DUPLICATE = 1 
                        OR IS_DUPLICATE = 0 
                        OR IS_DUPLICATE IS NULL 
                        GROUP BY REF_CALL)

UPDATE BOARDCALLS 
    SET IS_DUPLICATE_WITH = t2.IS_DUPLICATE_WITH,
        IS_PHONE = t2.IS_PHONE,
        IS_EMAIL = t2.IS_EMAIL,
        IS_DUPLICATE = t2.IS_DUPLICATE
FROM BOARDCALLS t1
INNER JOIN (
            SELECT REF_CALL,
            MAX(IS_DUPLICATE_WITH) IS_DUPLICATE_WITH,
            CASE WHEN COUNT(CASE WHEN IS_PHONE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_PHONE,
            CASE WHEN COUNT(CASE WHEN IS_EMAIL = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_EMAIL,
            CASE WHEN COUNT(CASE WHEN IS_DUPLICATE = '1' THEN 1 END) > 0 THEN 1 ELSE 0 END AS IS_DUPLICATE

            FROM BOARD_TASKS
            WHERE IS_DUPLICATE_WITH IS NOT NULL 
            OR IS_DUPLICATE = 1
            OR IS_DUPLICATE = 0
            OR IS_DUPLICATE IS NULL
            GROUP BY REF_CALL) t2 ON t1.REF_CALL = t2.REF_CALL