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How can I add a column that doesn't allow nulls in a Postgresql database?
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415
You have to set a default value.
ALTER TABLE mytable ADD COLUMN mycolumn character varying(50...
Table row and column number in jQuery
...lumn spans @grom?
– EarlyPoster
Mar 4 '11 at 13:35
@Forkrul Assail, @CMS It's fail with ROWSPAN's jsbin.com/eyeyu/1099...
mongo - couldn't connect to server 127.0.0.1:27017
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49
This error is what you would see if the mongo shell was not able to talk to the mongod server.
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Use different Python version with virtualenv
I have a Debian system currently running with python 2.5.4. I got virtualenv properly installed, everything is working fine. Is there a possibility that I can use a virtualenv with a different version of Python?
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How to assign colors to categorical variables in ggplot2 that have stable mapping?
...ond plot with only four of the levels
p2 <- p %+% droplevels(subset(dat[4:10,])) + colScale
The first plot looks like this:
and the second plot looks like this:
This way you don't need to remember or check each data frame to see that they have the appropriate levels.
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JavaScript + Unicode regexes
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TomalakTomalak
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How do you convert a JavaScript date to UTC?
... a string in simplified extended ISO
format (ISO 8601), which is always 24 or 27 characters long
(YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ,
respectively). The timezone is always zero UTC offset, as denoted by
the suffix "Z".
Source: MDN web docs
The format you need is c...
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Length of an integer in Python
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341
If you want the length of an integer as in the number of digits in the integer, you can always ...
How do I plot in real-time in a while loop using matplotlib?
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324
Here's the working version of the code in question (requires at least version Matplotlib 1.1.0 f...