说我有users.data包含...
Jeff 31 2
Niel 42 15
Chucky 42 15
Paul 48 15
Bert 18 0
Geoff 28 16
Kieth 64 31
Clyde 20 0
Greg 44 3
Bonnie 19 0
Meyer 34 6
Alice 41 3
在psql中,我创建了一个像这样的用户表......
ID | name | age | number
---+-------+-----+----------
1 Jeff 31 2
2 Niel 42 15
3 Chucky 42 15
4 Paul 48 15
5 Bert 18 0
6 Geoff 28 16
7 Kieth 64 31
8 Clyde 20 0
9 Greg 44 3
10 Bonnie 19 0
11 Meyer 34 6
12 Alice 41 3
然后我有events.data包含...
Jeff Party Newtown 2012-02-16
Jeff Work Oldtown 2005-03-30
Chucky Work Oldtown 2008-11-09
Niel Work Newtown 2005-02-28
Paul Party Newtown 2010-02-14
Bert Work Oldtown 2005-03-30
Geoff Work Newtown 2013-04-20
Kieth Sleep Oldtown 2009-08-03
Clyde Party Newtown 2012-02-16
Greg Work Newtown 2013-04-20
Bonnie Sleep Newtown 2009-08-30
Meyer Sleep Newtown 2008-10-30
Alice Work Newtown 2012-03-30
如何创建表格,事件,像这样?
ID | user_ID | event | city date
---+---------+-------+----------+--------------
1 1 Party Newtown 2012-02-16
2 1 Work Oldtown 2005-03-30
3 2 Work Oldtown 2008-11-09
4 3 Work Newtown 2005-02-28
5 4 Party Newtown 2010-02-14
6 5 Work Oldtown 2005-03-30
7 6 Work Newtown 2013-04-20
8 7 Sleep Oldtown 2009-08-03
9 8 Party Newtown 2012-02-16
10 9 Work Newtown 2013-04-20
11 10 Sleep Newtown 2009-08-30
12 11 Sleep Newtown 2008-10-30
13 12 Work Newtown 2012-03-30
基本上,当我填充我创建的表时,当我要将数据复制到文件时,我需要找到匹配事件记录的用户名属性的用户的id。因此,当您查看事件表时,而不是显示名称,而是显示同名用户的ID。
我该怎么做呢?当我使用时,我能做到这一点......
COPY events (user_ID, event, city, date) FROM :dir || 'events.data' WITH (/* ??? */);