我们可以在“已更改”列中获得“新记录” 对于au_id，它不存在于一个表中并存在于另一个表中
CREATE TABLE authors
(
au_id VARCHAR (100),
au_lname VARCHAR (100),
au_fname VARCHAR (100),
phone VARCHAR (100),
address VARCHAR (100),
city VARCHAR (100),
state VARCHAR (100),
zip VARCHAR (100),
[contract] VARCHAR (100)
)
INSERT authors
SELECT '1', 'address', 'KALIA','29' ,'Second Avenue' , '9',' Second', 'Avenue','LALQUILA' UNION ALL
SELECT '2', 'address', 'WALIA','279' ,'Hague Way', '79', 'Hague', 'Way','QUTUBMINAR' UNION ALL
SELECT '3', 'address', 'TOLIA','269', 'East Hague Street','69', 'East', 'Hague','Street'
SELECT * FROM authors
CREATE TABLE authorsCopy
(
au_id VARCHAR (100),
au_lname VARCHAR (100),
au_Fname VARCHAR (100),
phone VARCHAR (100),
address VARCHAR (100),
city VARCHAR (100),
state VARCHAR (100),
zip VARCHAR (100),
[contract] VARCHAR (100)
)
INSERT authorsCopy
SELECT '1', 'address', 'KALIA','29' ,'Second CHAIBASA' , '9',' Second', 'Avenue','LALQUILA' UNION ALL
SELECT '2', 'address', 'WALIA','279' ,'Hague Way', '79', 'Hague', 'Way','QUTUBMINAR' UNION ALL
SELECT '3', 'address', 'TOLIA', '269', 'East Hague Street','69', 'East', 'Hague','Street' UNION ALL
SELECT '4', 'address', 'MIR', '279' ,'TATANAGAR', '79', 'Hague', 'Way','QUTUBMINAR' UNION ALL
SELECT '5', 'address', 'WANGDU', '269', 'GHATSILA','69', 'East', 'Hague','Street'
SELECT * FROM authorsCopy
DECLARE @temp TABLE(au_id VARCHAR(11) PRIMARY KEY) /*this holds the primary keys of rows that have changed */
INSERT INTO @Temp(au_ID) --determine which rows have changed
SELECT au_ID
FROM --use the EXCEPT technique qhich is the quickest in our tests
(
SELECT au_id, au_lname, au_fname, phone, [address], city, state, zip, [contract]
FROM authors
EXCEPT
SELECT au_id, au_lname, au_fname, phone, address, city, state, zip, contract
FROM authorsCopy
)f--now we just SELECT those columns that have changed
SELECT lefthand.au_id,lefthand.name,lefthand.value AS original,Righthand.value AS changed
FROM (--now we just lay out the two tables as key value pairs, using the string versions of the data
SELECT authors.au_id, 'au_lname' AS 'name',au_lname AS 'value'
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'au_fname' AS 'name',au_fname AS 'value'
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'phone',phone
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'address',address
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'City' AS 'name',City AS 'value'
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'State',state
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'zip',zip
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id
UNION
SELECT authors.au_id, 'contract',CONVERT(CHAR(1),contract)
FROM authors LEFT OUTER JOIN @Temp altered ON altered.au_id=authors.au_id) LeftHand
LEFT OUTER JOIN (
SELECT authorsCopy.au_id, 'au_lname' AS 'name',au_lname AS 'value'
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'au_fname',au_fname
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'phone',phone
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'address',address
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'City' AS 'name',City AS 'value'
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'State',state
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'zip',zip
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id
UNION
SELECT authorsCopy.au_id, 'contract',CONVERT(CHAR(1),contract)
FROM authorsCopy LEFT OUTER JOIN @Temp altered ON altered.au_id=authorsCopy.au_id) rightHand
ON lefthand.au_ID=righthand.au_ID
AND lefthand.name=righthand.name
WHERE lefthand.value<>righthand.value
答案 0 :(得分：1)
sqldemon，我不会假装我的解决方案是雄辩的或花哨的，因为肯定会有其他方法来实现相同的结果。也就是说，当您在声明性SQL中编写代码并且不使用函数或存储过程时，我会假设您正在寻找简单直接的东西。下面是将返回位值的查询，允许您识别来自Authors表的哪些记录是新的以及哪些记录已经以某种方式更改并识别更改的列。您可以将最终的select语句转换为另一个CTE或将其结果加载到临时表中，并使用它返回最适合您的方法（例如，新值与旧值并排）。
With New_Records as (
Select c.au_id
From #authorsCopy c
Left Outer Join #authors a
on a.au_id = c.au_id
Where a.au_id is null
)
Select a.au_id
, CAST(Case
When n.au_id is not null
Then 1
Else 0
End as bit) as new_record
, CAST(Case
When c.au_id is not null
Then 1
Else 0
End as bit) as changed_record
, CAST(Case
When a.au_fname <> c.au_Fname
Then 1
Else 0
End as bit) as au_fname_diff
, CAST(Case
When a.au_lname <> c.au_lname
Then 1
Else 0
End as bit) as au_lname_diff
, CAST(Case
When a.address <> c.address
Then 1
Else 0
End as bit) as address_diff
, CAST(Case
When a.city <> c.city
Then 1
Else 0
End as bit) as city_diff
, CAST(Case
When a.state <> c.state
Then 1
Else 0
End as bit) as state_diff
, CAST(Case
When a.phone <> c.phone
Then 1
Else 0
End as bit) as phone_diff
, CAST(Case
When a.contract <> c.contract
Then 1
Else 0
End as bit) as contract_diff
From #authors a
Left Outer Join New_Records n
on a.au_id = n.au_id
Left Outer Join #authorsCopy c
on a.au_id = c.au_id
and (a.au_fname <> c.au_Fname
or a.au_lname <> c.au_lname
or a.address <> c.address
or a.city <> c.city
or a.state <> c.state
or a.zip <> c.zip
or a.phone <> c.phone
or a.contract <> c.contract)