sql - 比较数据并将数据插入表中

Question

我有两个表，一个是临时表，另一个是数据库表。我需要根据 MM 和 ProjectID 比较两个表。如果数据存在于 @mtts 但不存在于 tbl_snapshot 中，那么我必须将其插入 tbl_sanpshot

@mtts 表([MM],[YYYY],[month_Start],[month_Finish],[ProjectID],[ProjectedBillable],[ProjectedPayable],[ActualBilled],[ActualPaid],[Total_To_Bill],[Total_To_Pay])

tbl_Snapshot ([MM],[YYYY],[month_Start],[month_Finish],[ProjectID],[ProjectedBillable],[ProjectedPayable],[ActualBilled],[ActualPaid],[Total_To_Bill],[Total_To_Pay])。

我是 sql.so 的新手，所以请帮助我

Answer 1

您可以使用INSERT INTO...SELECTandEXISTS来解决您的问题，试试这个

INSERT INTO tbl_Snapshot([MM],[YYYY],[month_Start],[month_Finish],
                         [ProjectID],[ProjectedBillable],[ProjectedPayable],
                         [ActualBilled],[ActualPaid],[Total_To_Bill],
                         [Total_To_Pay])
SELECT *
FROM mtts
WHERE NOT EXISTS (SELECT * FROM tbl_Snapshot)

Answer 2

除了 John Woo 的建议之外，这里还有两个选择。

使用左连接

INSERT INTO tbl_Snapshot
SELECT *
FROM @mtts mtts 
LEFT JOIN tbl_Snapshot ss ON mtts.MM = ss.MM AND mtts.ProjectID = ss.ProjectID
WHERE ss.MM IS NULL AND ss.tbl_Snapshot IS NULL

使用 Merge 语句（将从 Sql Server 2008 开始工作）

MERGE tbl_Snapshot AS ss
USING (SELECT * FROM @mtts) AS mtts
ON mtts.MM = ss.MM AND mtts.ProjectID = ss.ProjectID
WHEN NOT MATCHED THEN
INSERT([MM],[YYYY],[month_Start],[month_Finish],[ProjectID],[ProjectedBillable],[ProjectedPayable],
       [ActualBilled],[ActualPaid],[Total_To_Bill],[Total_To_Pay])
VALUES(mm.[MM],mm.[YYYY],mm.[month_Start],mm.[month_Finish],mm.[ProjectID],mm.[ProjectedBillable],mm.[ProjectedPayable],
       mm.[ActualBilled],mm.[ActualPaid],mm.[Total_To_Bill],mm.[Total_To_Pay]);

这是一种非常肮脏的方式（CAST 到 VARCHAR，然后是 MERGE，最后是 COMPARE）

INSERT INTO tbl_Snapshot
SELECT *
FROM @mtts mtts  
WHERE CAST(mtts.MM AS vARCHAR(10)) + CAST(mtts.ProjectID AS VARCHAR(10))
NOT IN (SELECT CAST(ss.MM AS vARCHAR(10)) + CAST(ss.ProjectID AS VARCHAR(10)) FROM tbl_Snapshot ss)

Answer 3

尝试这个 ，

插入 tbl_Snapshot select * from @mtts where [MM] not in(select [MM] from tbl_Snapshot) and [ProjectID] not in (select [ProjectID] from tbl_Snapshot)

谢谢，

文卡特