Question

我有以下SP，

    MERGE INTO DeviceCatalog DC
    USING (SELECT @UniqueID AS UniqueID) T ON (DC.UniqueID = T.UniqueID)
    WHEN MATCHED THEN
        UPDATE   

    WHEN NOT MATCHED THEN
        INSERT  

    WHEN NOT MATCHED THEN
    IF(Condition)
    BEGIN
        EXEC DeleteDeviceID;
    END;

我不知道如何使这项工作？请帮忙

更新：我能够做到这一点，

    MERGE INTO DeviceCatalog DC
    USING (SELECT @UniqueID AS UniqueID) T ON (DC.UniqueID = T.UniqueID)
    WHEN MATCHED THEN
        UPDATE   

    WHEN NOT MATCHED THEN
        INSERT  

    WHEN NOT MATCHED THEN
        DELETE WHERE    [UniqueID] = @OldUniqueID; 
    END

但只有删除声明才会抱怨。

Answer 1

MERGE语句的“WHEN NOT MATCHED”子句不支持删除。你必须使用'当不匹配来源'时。

MERGE INTO DeviceCatalog DC
USING (SELECT @UniqueID AS UniqueID) T ON (DC.UniqueID = T.UniqueID)
WHEN MATCHED THEN
    UPDATE  SET col1='somevalue'

WHEN NOT MATCHED THEN
    INSERT INTO  article (UniqueID) VALUES 'somevalue'

WHEN NOT MATCHED BY SOURCE AND UniqueID = @OldUniqueID  THEN
    DELETE;

Answer 2

MERGE INTO DeviceCatalog DC
    USING (SELECT @UniqueID AS UniqueID) T ON (DC.UniqueID = T.UniqueID)
    WHEN MATCHED THEN
        UPDATE  [write what you hav to update] 

    WHEN NOT MATCHED THEN
        INSERT  [write what to insert] 

    WHEN NOT MATCHED THEN
        DELETE WHERE    [UniqueID] = @OldUniqueID; 
    END

请注意：http://blog.sqlauthority.com/2008/08/28/sql-server-2008-introduction-to-merge-statement-one-statement-for-insert-update-delete/

MERGE不与Exec SP合作

2 个答案: