홈>2020-03-18 12:34

sql - 문자열 행 대신 열로 분할

샘플 데이터 :

id  email_address                                   email_new
-------------------------------------------------------------------------------
1   [email protected]                      [email protected]
2   [email protected]; [email protected]      [email protected]
2   [email protected]; [email protected]      [email protected]
3   [email protected]; [email protected]; [email protected]  [email protected]
3   [email protected]; [email protected]; [email protected]  [email protected]
3   [email protected]; [email protected]; [email protected]  [email protected]

다음 쿼리를 사용하여 ' ; 를 분할했습니다. '문자열을 행으로 구분 :

SELECT
    id, email_address, email_new
FROM 
    (SELECT 
         id, email_address, 
         Split.a.value('.', 'NVARCHAR(max)') AS email_new 
     FROM
         (SELECT 
              id, email_address, CAST ('<M>' + REPLACE(email_address, '; ', '</M><M>') + '</M>' AS XML) email_new
          FROM 
              table) AS A 
     CROSS APPLY 
         email_new.nodes ('/M') AS Split(a)) x
GROUP BY
    id, email_address, email_new

질문과 관련된 문제는 모든 분할 이메일 주소에 대해 새 행을 만들고 싶지 않다는 것입니다. 새 열을 추가하고 싶습니다.

id  email_1                      email_2                email_3
------------------------------------------------------------------------------
1   [email protected]   null                   null
2   [email protected]         [email protected]   null
3   [email protected]                  [email protected]            [email protected]

email_address 열에는 최대 3 개의 분리 된 전자 메일 주소가 있습니다. 어떤 제안? 3 이상으로 커질 경우 응답이 n 열을 차지할 수 있다면 가장 좋습니다.

sqlsql-server

답변 # 1

테스트 데이터

Declare @t table (Id INT, email_address VARCHAR(1000) , email_new VARCHAR(100));
INSERT INTO @t VALUES
(1   ,'[email protected]'                      , '[email protected]'),
(2   ,'[email protected]; [email protected]'      , '[email protected]'      ),
(2   ,'[email protected]; [email protected]'      , '[email protected]'      ),
(3   ,'[email protected]; [email protected]; [email protected]'  , '[email protected]'               ),
(3   ,'[email protected]; [email protected]; [email protected]'  , '[email protected]'               ),
(3   ,'[email protected]; [email protected]; [email protected]'  , '[email protected]'      );

쿼리

WITH Emails (ID , XmlEmail, email_new)
AS
(
    SELECT Id
          , CONVERT(XML,'<Emails><email>'  
                    + REPLACE(email_address,';', '</email><email>') 
                    + '</email></Emails>') AS XmlEmail
          , email_new
      FROM @t
)
 SELECT   ID
        , XmlEmail.value('/Emails[1]/email[1]','varchar(100)') AS Email1
        , XmlEmail.value('/Emails[1]/email[2]','varchar(100)') AS Email2
        , XmlEmail.value('/Emails[1]/email[3]','varchar(100)') AS Email3
        , XmlEmail.value('/Emails[1]/email[4]','varchar(100)') AS Email4
        , XmlEmail.value('/Emails[1]/email[5]','varchar(100)') AS Email5
        , email_new
FROM Emails

결과

╔════╦════════════════════════════╦═══════════════════════╦═══════════════════════╦═════════╦═════════╦════════════════════════════╗
║ ID ║           Email1           ║        Email2         ║        Email3         ║ Email4  ║ Email5  ║         email_new          ║
╠════╬════════════════════════════╬═══════════════════════╬═══════════════════════╬═════════╬═════════╬════════════════════════════╣
║  1 ║ [email protected] ║ NULL                  ║ NULL                  ║ NULL    ║ NULL    ║ [email protected] ║
║  2 ║ [email protected]       ║  [email protected] ║ NULL                  ║ NULL    ║ NULL    ║ [email protected]       ║
║  2 ║ [email protected]       ║  [email protected] ║ NULL                  ║ NULL    ║ NULL    ║ [email protected]       ║
║  3 ║ [email protected]                ║  [email protected]          ║  [email protected] ║ NULL    ║ NULL    ║ [email protected]                ║
║  3 ║ [email protected]                ║  [email protected]          ║  [email protected] ║ NULL    ║ NULL    ║ [email protected]                ║
║  3 ║ [email protected]                ║  [email protected]          ║  [email protected] ║ NULL    ║ NULL    ║ [email protected]       ║
╚════╩════════════════════════════╩═══════════════════════╩═══════════════════════╩═════════╩═════════╩════════════════════════════╝

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sql - 문자열 행 대신 열로 분할

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