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我第一次尝试 MERGE 运行没有遇到任何错误，但它没有像我想要的那样合并数据。谁能告诉我我做错了什么？重点是比较#Temp 和#tblCollectionGameList 并更新#tblCollectionGameList，使其仅包含#Temp 中的项目（将缺失的项目插入tblCollecitonGameList 并从tblCollectionGameList 中删除不再在#Temp 中的项目）

    CREATE TABLE #Temp
(
    CollectionID smallint NOT NULL,
    IncludedSectionID smallint NOT NULL
)

INSERT INTO #Temp (CollectionID, IncludedSectionID) VALUES(0, 0);
INSERT INTO #Temp (CollectionID, IncludedSectionID) VALUES(0, 1);

SELECT * FROM #Temp;

CREATE TABLE #tblCollectionGameList
(
    ID smallint IDENTITY(0,1) NOT NULL,
    CollectionID smallint NOT NULL,
    IncludedSectionID smallint
)

INSERT INTO #tblCollectionGameList (CollectionID, IncludedSectionID) VALUES(0,0);
INSERT INTO #tblCollectionGameList (CollectionID, INcludedSectionID) VALUES(0,2);

SELECT * FROM #tblCollectionGameList;

BEGIN TRAN

MERGE #tblCollectionGameList AS t
USING #Temp AS s
ON (t.CollectionID = s.CollectionID)
WHEN NOT MATCHED BY TARGET
    THEN
        INSERT(CollectionID, IncludedSectionID) VALUES (s.CollectionID, s.IncludedSectionID)
WHEN NOT MATCHED BY SOURCE
    THEN
        DELETE;

SELECT * FROM #tblCollectionGameList;

ROLLBACK TRAN

DROP TABLE #Temp;
DROP TABLE #tblCollectionGameList;
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1 回答 1

0

您的问题是您要加入一个非唯一的列。

一切都有CollectionID = 1，所以一切都匹配 - 没有符合NOT MATCHED BY TARGET条件的行，也没有符合NOT MATCHED BY SOURCE条件的行。

而是尝试CollectionID在表中创建唯一性。

INSERT INTO #Temp (CollectionID, IncludedSectionID) VALUES(0, 0);
INSERT INTO #Temp (CollectionID, IncludedSectionID) VALUES(1, 1);

INSERT INTO #tblCollectionGameList (CollectionID, IncludedSectionID) VALUES(0,0);
INSERT INTO #tblCollectionGameList (CollectionID, INcludedSectionID) VALUES(2,2);
于 2012-10-04T00:48:28.993 回答