移調和具有不同的價值

Question

，我有以下表的更復雜的版本插入多行：

ID | FIRST | LAST  | EMAIL 
1 | John | Doe  | jdoe@example.com 
1 | Mack | Johnson | mjohnson@example.com 
1 | Steven | Michaels | smichaels@example.com 
2 | Sarah | Sampson | ssampson@example.com 
2 | Tom | Smith | tsmith@example.com 
2 | Jane | Rogers | jrogers@example.com 
3 | Bob | Johns | bjohns@example.com 
3 | Kim | Lane  | klane@example.com 
3 | Ron | Swanson | rswanson@example.com 

，我想編寫一個查詢中插入該數據到另一個表看起來像這樣（的表已存在）：

ID | first1 | last1 | email1    | first2 | last2 | email2    | first3 | last3 | email3 
1 | John | Doe  | jdoe@example.com  | Mack | Johnson | mjohnson@example.com | Steven | Michaels | smichaels@example.com 
2 | Sarah | Sampson | ssampson@example.com | Tom | Smith | tsmith@example.com | Jane | Rogers  | jrogers@example.com 
3 | Bob | Johns | bjohns@example.com | Kim | Lane  | klane@example.com | Ron | Swanson  | rswanson@example.com 

我覺得這應該很容易，但概念正在逃避我。完成此操作的最佳實踐是什麼？

也許我還應該提到，我已經寫了一個函數，可以傳遞ID，索引號和列名以返回值（即getpersoninfo（2，'1'，'first'）返回莎拉）。

select a_id, 
    FIRST1, LAST1, EMAIL1, 
    FIRST2, LAST2, EMAIL2, 
    FIRST3, LAST3, EMAIL3 
from 
(
    select a_id, col||rn as new_col, value 
    from 
    (
    select a_id, first_name, last_name, email, 
     cast(row_number() over(partition by a_id order by a_id) as varchar2(10)) rn 
    from dump_recs_2015 
) 
    unpivot 
    (
    value 
    for col in (first_name, last_name, email) 
) 
) 
pivot 
(
    max(value) 
    for new_col in ('FIRST1' FIRST1, 'LAST1' LAST1, 'EMAIL1' EMAIL1, 
        'FIRST2' FIRST2, 'LAST2' LAST2, 'EMAIL2' EMAIL2, 
        'FIRST3' FIRST3, 'LAST3' LAST3, 'EMAIL3' EMAIL3) 
); 

Answer 1

由於使用的是Oracle 11g中，可以同時實現UNPIVOT和PIVOT功能。

UNPIVOT將把您的列first,last和email並將值轉換爲行。然後你就可以PIVOT新名稱First1等爲列：

select id, 
    First1, Last1, Email1, 
    First2, Last2, Email2, 
    First3, Last3, Email3 
from 
(
    select id, col||rn as new_col, value 
    from 
    (
    select id, first, last, email, 
     cast(row_number() over(partition by id order by id) as varchar2(10)) rn 
    from yourtable 
) 
    unpivot 
    (
    value 
    for col in (first, last, email) 
) 
) 
pivot 
(
    max(value) 
    for new_col in ('FIRST1' First1, 'LAST1' Last1, 'EMAIL1' Email1, 
        'FIRST2' First2, 'LAST2' Last2, 'EMAIL2' Email2, 
        'FIRST3' First3, 'LAST3' Last3, 'EMAIL3' Email3) 
) 

見SQL Fiddle with Demo。這可以在INSERT語句中用於將數據加載到新表中。

編輯，根據您的列名的更改，您將使用：

select a_id, 
    First1, Last1, Email1, 
    First2, Last2, Email2, 
    First3, Last3, Email3 
from 
(
    select a_id, col||rn as new_col, value 
    from 
    (
    select a_id, first_name, last_name, email, 
     cast(row_number() over(partition by a_id order by a_id) as varchar2(10)) rn 
    from yourtable 
) 
    unpivot 
    (
    value 
    for col in (first_name, last_name, email) 
) 
) 
pivot 
(
    max(value) 
    for new_col in ('FIRST_NAME1' First1, 'LAST_NAME1' Last1, 'EMAIL1' Email1, 
        'FIRST_NAME2' First2, 'LAST_NAME2' Last2, 'EMAIL2' Email2, 
        'FIRST_NAME3' First3, 'LAST_NAME3' Last3, 'EMAIL3' Email3) 
) 

見SQL Fiddle with Demo