我想改变我的表并向SPARSE包含大量NULL值的所有字段添加选项.这个ALTER TABLE命令的正确语法是什么？
我正在尝试在远程服务器上执行以下语句:
Invoke-Command -ComputerName server1 -ScriptBlock {Get-Process}
但是我收到一条错误消息:
[server1] Connecting to remote server failed with the following error message : The client cannot connect to the destination specified in the request. Verify that the serv
ice on the destination is running and is accepting requests. Consult the logs and documentation for the WS-Management service running on the destination, most commonly IIS
or WinRM. If the destination is the WinRM service, run the following command on the destination to analyze and configure …我对PowerShell snap和其他与SQL Server交互的"工具"感到困惑.那么这些工具之间有什么区别:
我有这样的数据集:
Year MM DD HH
158 2010 7 1 5
159 2010 7 1 5
160 2010 7 1 6
161 2010 7 1 6
structure(list(Year = c(2010L, 2010L, 2010L, 2010L), MM = c(7L,
7L, 7L, 7L), DD = c(1L, 1L, 1L, 1L), HH = c(5L, 5L, 6L, 6L)), .Names = c("Year",
"MM", "DD", "HH"), row.names = 158:161, class = "data.frame")
如何从此数据集创建一个日期时间对象(此数据的新列)？
我正在尝试在Oracle sqlplus接口中编写for循环.当写一个循环语句按一下输入时,我收到一个错误:
SQL> for i in 1..10 loop
SP2-0734: unknown command beginning "for i in 1..." - rest of line ignored.
SQL>
我的for循环子句有问题吗？
如何根据值对表进行子集并返回这些值？这只返回索引:
with(chickwts, table(feed))
with(chickwts, table(feed)) > 11
which(with(chickwts, table(feed)) > 11)
产量
> with(chickwts, table(feed))
feed
casein horsebean linseed meatmeal soybean sunflower
12 10 12 11 14 12
> with(chickwts, table(feed)) > 11
feed
casein horsebean linseed meatmeal soybean sunflower
TRUE FALSE TRUE FALSE TRUE TRUE
> which(with(chickwts, table(feed)) > 11)
casein linseed soybean sunflower
1 3 5 6
我有这样一张桌子:
+---------+--------+
| EMP_ID | MGR_iD |
+---------+--------+
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 2 |
| 7 | 3 |
| 8 | 5 |
| 9 | 7 |
| 10 | 5 |
| 11 | 7 |
| 12 | 9 |
| 13 | 9 |
| 14 | 9 |
+---------+--------+
我正在尝试解析此相邻列表以生成以下结果集: …
我有一个包含这样的数据的文本文件:
This is just text
-------------------------------
Username: SOMETHI C: [Text]
Account: DFAG Finish time: 1-JAN-2011 00:31:58.91
Process ID: 2028aaB Start time: 31-DEC-2010 20:27:15.30
This is just text
-------------------------------
Username: SOMEGG C: [Text]
Account: DFAG Finish time: 1-JAN-2011 00:31:58.91
Process ID: 20dd33DB Start time: 12-DEC-2010 20:27:15.30
This is just text
-------------------------------
Username: SOMEYY C: [Text]
Account: DFAG Finish time: 1-JAN-2011 00:31:58.91
Process ID: 202223DB Start time: 15-DEC-2010 20:27:15.30
有没有办法从这种数据中提取用户名,完成时间,开始时间？我正在寻找一些起点使用R或Powershell.
编辑:我正在寻找这个问题的解决方案现在也与其他编程语言.
根据我提出的另一个问题,我有一个这样的数据集(对于R用户,下面是dput),它代表用户计算机会话:
username machine start end
1 user1 D5599.domain.com 2011-01-03 09:44:18 2011-01-03 09:47:27
2 user1 D5599.domain.com 2011-01-03 09:46:29 2011-01-03 10:09:16
3 user1 D5599.domain.com 2011-01-03 14:07:36 2011-01-03 14:56:17
4 user1 D5599.domain.com 2011-01-05 15:03:17 2011-01-05 15:23:15
5 user1 D5599.domain.com 2011-02-14 14:33:39 2011-02-14 14:40:16
6 user1 D5599.domain.com 2011-02-23 13:54:30 2011-02-23 13:58:23
7 user1 D5599.domain.com 2011-03-21 10:10:18 2011-03-21 10:32:22
8 user1 D5645.domain.com 2011-06-09 10:12:41 2011-06-09 10:58:59
9 user1 D5682.domain.com 2011-01-03 12:03:45 2011-01-03 12:29:43
10 USER2 D5682.domain.com 2011-01-12 14:26:05 2011-01-12 14:32:53 …我正在尝试为R找到一个函数,它输出data.frameMySQL样式ascii表中的对象
+----+------+------+
| id | var1 | var2 |
+----+------+------+
| 1 | asdf | g |
| 2 | asdf | h |
| 3 | asdf | j |
+----+------+------+
有这样的功能吗？至少有两种工具可供选择
但有没有办法直接从R做到这一点？