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PostgreSQL - fetch the row which has the Max value for a column
I'm dealing with a Postgres table (called "lives") that contains records with columns for time_stamp, usr_id, transaction_id, and lives_remaining. I need a query that will give me the most recent lives_remaining total for each usr_id
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What do the python file extensions, .pyc .pyd .pyo stand for?
What do these python file extensions mean?
2 Answers
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How to plot two columns of a pandas data frame using points?
I have a pandas data frame and would like to plot values from one column versus the values from another column. Fortunately, there is plot method associated with the data-frames that seems to do what I need:
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Python, compute list difference
In Python, what is the best way to compute the difference between two lists?
14 Answers
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Does Python have an ordered set?
Python has an ordered dictionary . What about an ordered set?
14 Answers
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Creating JS object with Object.create(null)?
I know a lot of ways to create JS objects but I didn't know the Object.create(null) 's one.
5 Answers
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How to find the php.ini file used by the command line?
I need to enable pdo_mysql in my EasyPhp environment, so I went to php.ini file and uncommented the following line:
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What is reflection and why is it useful?
What is reflection, and why is it useful?
21 Answers
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How does this milw0rm heap spraying exploit work?
I usually do not have difficulty to read JavaScript code but for this one I can’t figure out the logic. The code is from an exploit that has been published 4 days ago. You can find it at milw0rm .
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What is the difference between “mvn deploy” to a local repo and “mvn install”?
My team uses an internal team maven repo that is shared from a development server using Apache. We also run the Continuum CI server on the same machine. Maven builds in Continuum are run with the "install" goal, which copies the final artifact directly into the shared directory.
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