모형
CREATE TABLE #customers (ID INT IDENTITY, name VARCHAR(50), shortname VARCHAR(10))
INSERT INTO #customers VALUES
('Michael Smith', 'Michae')
,('Michael Douglas', 'Mich_1')
,('Michael Yang', 'Mich_3')
,('Testman', 'Testma')
,('Testman1', 'Test_1');
CREATE TABLE #newcustomers (ID INT IDENTITY,name VARCHAR(50), shortname VARCHAR(10) NULL)
INSERT INTO #newcustomers (name) VALUES
('Michael Black')
,('Michael White')
,('Testman2')
,('Someone new');
--This CTE는 기존의 모든 이름
결합합니다
WITH AllNames AS
(
SELECT '1_old' AS datasource,ID,name,shortname FROM #customers
UNION ALL SELECT '2_new',ID,name,shortname FROM #newcustomers
)
--This CTE가 결합 된 목록을 사용하므로이
테이블을보십시오 올바른 "색인"을 계산하십시오
,ShortNames AS
(
SELECT c.*
,A.First6
,ROW_NUMBER() OVER(PARTITION BY A.First6 ORDER BY datasource,ID) AS NrTotal
,ROW_NUMBER() OVER(PARTITION BY datasource,A.First6 ORDER BY datasource,ID) AS Nr
,CASE WHEN ISNUMERIC(SUBSTRING(shortname+' ',6,10))=1
THEN CAST(SUBSTRING(shortname+' ',6,10) AS INT) ELSE 0 END AS ExistIndex
FROM AllNames AS c
CROSS APPLY(SELECT LEFT(name + ' ',6)) AS A(First6)
)
--all NrTotal 새로운 = 1, 다른 모든 인덱스
SELECT *
,CASE WHEN datasource='1_old' THEN shortname ELSE
CASE WHEN datasource='2_new' AND NrTotal=1 THEN First6
ELSE LEFT(First6,4) + '_' + CAST(Nr + (SELECT ISNULL(MAX(x.ExistIndex),1)
FROM ShortNames AS x
WHERE x.First6=ShortNames.First6) AS VARCHAR(5))
END
END
FROM ShortNames
GO
DROP TABLE #customers;
DROP TABLE #newcustomers;
에게 그 결과
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| datasource | ID | name | shortname | First6 | NrTotal | Nr | ExistIndex | (Kein Spaltenname) |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 1_old | 1 | Michael Smith | Michae | Michae | 1 | 1 | 0 | Michae |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 1_old | 2 | Michael Douglas | Mich_1 | Michae | 2 | 2 | 1 | Mich_1 |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 1_old | 3 | Michael Yang | Mich_3 | Michae | 3 | 3 | 3 | Mich_3 |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 1_old | 4 | Testman | Testma | Testma | 1 | 1 | 0 | Testma |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 1_old | 5 | Testman1 | Test_1 | Testma | 2 | 2 | 1 | Test_1 |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 2_new | 1 | Michael Black | NULL | Michae | 4 | 1 | 0 | Mich_4 |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 2_new | 2 | Michael White | NULL | Michae | 5 | 2 | 0 | Mich_5 |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 2_new | 4 | Someone new | NULL | Someon | 1 | 1 | 0 | Someon |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
| 2_new | 3 | Testman2 | NULL | Testma | 3 | 1 | 0 | Test_2 |
+------------+----+-----------------+-----------+--------+---------+----+------------+--------------------+
그냥'WHILE' 것 또한 메모, 등을 얻을 그대로 6 편지를 얻을 커서로 실행된다. 그것은 같은 구현체를 사용할 것이고, 그것은 단지 WHILE 형태로 가려져 있습니다. –
'Micahel Douglas'에 오타가 있습니다. – Shnugo
Btw : 좋은 질문입니다. 특히 copy'n'pasteable 테스트 시나리오가 훌륭합니다. 자신의 노력, 명확한 설명 ... +1 – Shnugo