Upsert-SQL Server 2005

Question

我有两个表：

1. NewNotes
2. MasterNotes

每个月， NewNotes表都会更新新帐户和现有帐户的新笔记。 我需要更新MasterNotes表中的现有注释，或者如果MasterNotes表中还没有帐号，则插入新注释。

两个表都有三列： REPORT ， ACCOUNT_NUMBER ， NOTES 。

要更新一条记录，帐号和报告都必须相同（ MasterNotes表可以具有两个不同的帐号，其中包含两个不同的报告）。

有人可以帮忙吗？

到目前为止，这是我的想法：

IF NOT EXISTS
(
SELECT REP, ACCOUNT_NUMBER
FROM MasterNotes
WHERE REP = (SELECT Report FROM NewNotes) AND
      ACCOUNT_NUMBER = (SELECT AccountNo FROM NewNotes)
)
INSERT INTO MasterNotes
ELSE
UPDATE

我知道这是不正确的，因为子查询返回的值不止一个，但是我要注意确定如何逐行处理它。

或者也许是这样？

INSERT INTO MasterNotes
SELECT Report, AccountNo, A.Notes
FROM NewNotes A 
LEFT OUTER JOIN MasterNotes B
    ON A.Report = B.REP AND A.AccountNo = B.ACCOUNT_NUMBER
WHERE B.ACCOUNT_NUMBER IS NULL AND B.REP IS NULL
UPDATE MasterNotes
SET NOTE = B.Notes
FROM MasterNotes A, NewNotes B
WHERE A.ACCOUNT_NUMBER = B.AccountNo AND A.REP = B.Report

Answer 1

这里有一些样本可以帮助您入门。 我提供了两种在SQL2005中执行这两种操作的方式。 我个人更喜欢JOIN方法，但是事实证明它们的速度稍慢-但我发现它们更易于编写/阅读。 它们在内部，但已被注释掉。

DECLARE @NewNotes TABLE (REPORT VARCHAR(10), ACCOUNT_NUMBER INT, NOTES VARCHAR(50))
DECLARE @MasterNotes TABLE (REPORT VARCHAR(10), ACCOUNT_NUMBER INT, NOTES VARCHAR(50))

INSERT INTO @MasterNotes (REPORT, ACCOUNT_NUMBER, NOTES)
SELECT 'ABC', 123, 'CUSTOMER IS VERY NICE, SOMETIMES...' UNION
SELECT 'DEF', 456, 'CUSTOMER IS ANGRY'

INSERT INTO @NewNotes (REPORT, ACCOUNT_NUMBER, NOTES)
SELECT 'ABC', 123, 'CUSTOMER IS VERY NICE' UNION
SELECT 'DEF', 456, 'CUSTOMER IS ANGRY' UNION
SELECT 'GHI', 789, 'CUSTOMER WANTS CALL BACK'

UPDATE M SET NOTES = N.NOTES
FROM @MasterNotes M, @NewNotes N
WHERE M.REPORT = N.REPORT
AND M.ACCOUNT_NUMBER = N.ACCOUNT_NUMBER

/** ALTERNATE UPDATE METHOD **/
--UPDATE M SET NOTES = N.NOTES
--FROM @MasterNotes M
--JOIN @NewNotes N
--   ON M.REPORT = N.REPORT
--   AND M.ACCOUNT_NUMBER = N.ACCOUNT_NUMBER

INSERT INTO @MasterNotes (REPORT, ACCOUNT_NUMBER, NOTES)
SELECT N.REPORT, N.ACCOUNT_NUMBER, N.NOTES
FROM @NewNotes N
WHERE NOT EXISTS (SELECT ACCOUNT_NUMBER FROM @MasterNotes M WHERE M.REPORT = N.REPORT)  

/** ALTERNATE INSERT METHOD **/
--INSERT INTO @MasterNotes (REPORT, ACCOUNT_NUMBER, NOTES)
--SELECT  N.REPORT, N.ACCOUNT_NUMBER, N.NOTES
--FROM @NewNotes N
--LEFT OUTER JOIN @MasterNotes M 
--   ON N.REPORT = M.REPORT
--   AND N.ACCOUNT_NUMBER = M.ACCOUNT_NUMBER
--WHERE M.ACCOUNT_NUMBER IS NULL   

SELECT *
FROM @MasterNotes

注意：如果要更新到SQL2008 +，则可以使用MERGE函数，如下所示：

DECLARE @NewNotes TABLE (REPORT VARCHAR(10), ACCOUNT_NUMBER INT, NOTES VARCHAR(50))
DECLARE @MasterNotes TABLE (REPORT VARCHAR(10), ACCOUNT_NUMBER INT, NOTES VARCHAR(50))

INSERT INTO @MasterNotes (REPORT, ACCOUNT_NUMBER, NOTES)
SELECT 'ABC', 123, 'CUSTOMER IS VERY NICE, SOMETIMES...' UNION
SELECT 'DEF', 456, 'CUSTOMER IS ANGRY'

INSERT INTO @NewNotes (REPORT, ACCOUNT_NUMBER, NOTES)
SELECT 'ABC', 123, 'CUSTOMER IS VERY NICE' UNION
SELECT 'DEF', 456, 'CUSTOMER IS ANGRY' UNION
SELECT 'GHI', 789, 'CUSTOMER WANTS CALL BACK'

MERGE INTO @MasterNotes AS DST
USING (SELECT REPORT, ACCOUNT_NUMBER, NOTES FROM @NewNotes) AS SRC
    ON SRC.ACCOUNT_NUMBER = DST.ACCOUNT_NUMBER
WHEN MATCHED THEN UPDATE
    SET DST.REPORT = SRC.REPORT,
        DST.NOTES = SRC.NOTES
WHEN NOT MATCHED THEN 
    INSERT (REPORT, ACCOUNT_NUMBER, NOTES)
    VALUES (SRC.REPORT, SRC.ACCOUNT_NUMBER, SRC.NOTES);

SELECT *
FROM @MasterNotes