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How to get cumulative sum
... Col1,
SUM(Col1) OVER(ORDER BY RowId ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS Col2
FROM tablehh
ORDER BY RowId
or
SELECT
GroupID,
RowID,
Col1,
SUM(Col1) OVER(PARTITION BY GroupID ORDER BY RowId ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS Col2
FROM tabl...
How can I avoid Java code in JSP files, using JSP 2?
I'm new to Java EE and I know that something like the following three lines
31 Answers
...
How can I rename a database column in a Ruby on Rails migration?
...mething else or do nothing
end
end
For Rails 3.1 use:
While, the up and down methods still apply, Rails 3.1 receives a change method that "knows how to migrate your database and reverse it when the migration is rolled back without the need to write a separate down method".
See "Active Record...
Diff files present in two different directories
...compare all the files present in both the directories using the diff command. Is there a simple command line option to do it, or do I have to write a shell script to get the file listing and then iterate through them?
...
How do I do multiple CASE WHEN conditions using SQL Server 2008?
...s a combination of the first two, with the outer case being the first type and the inner case being the second type.
– flygoing
Sep 19 '17 at 14:01
add a comment
...
What is the difference between class and instance methods?
What's the difference between a class method and an instance method?
18 Answers
18
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Value cannot be null. Parameter name: source
...
I had this one a while back, and the answer isn't necessarily what you'd expect. This error message often crops up when your connection string is wrong.
At a guess, you'll need something like this:
<connectionStrings>
<add name="hublisherE...
Constantly print Subprocess output while process is running
...
You can use iter to process lines as soon as the command outputs them: lines = iter(fd.readline, ""). Here's a full example showing a typical use case (thanks to @jfs for helping out):
from __future__ import print_function # Only Python 2.x
import subprocess
def execute(cmd):...
How to create a release signed apk file using Gradle?
...KEY_ALIAS=*****
RELEASE_KEY_PASSWORD=*****
Modify your app/build.gradle, and add this inside the android { code block:
...
signingConfigs {
release {
storeFile file(RELEASE_STORE_FILE)
storePassword RELEASE_STORE_PASSWORD
keyAlias RELEASE_KEY_ALIAS
keyPassword ...
Ruby on Rails production log rotation
...ted setups
config.logger = SyslogLogger.new
That way, you log to syslog, and can use default logrotate tools to rotate the logs.
Option 2: normal Rails logs + logrotate
Another option is to simply configure logrotate to pick up the logs left by rails.
On Ubuntu and Debian that would be, for ex...