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How can I add a column that doesn't allow nulls in a Postgresql database?
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@allan.simon I've never used PostgreSQL before and I don't have it installed anywhere.
– Sean Bright
Oct 18 '15 at 19:50
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Cross-referencing commits in github
...people can find it without following the link to the Autolinked References and URLs section of the GitHub help:
User/Project@SHA
For example:
mojombo/god@be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
Short SHAs work as well (as long as they are unique):
mojombo/god@be6a8cc
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How to run a shell script on a Unix console or Mac terminal?
I know it, forget it and relearn it again. Time to write it down.
7 Answers
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Do I need to store the salt with bcrypt?
...ng characters represented the hash value. The checker function knows this, and pulls the hash apart to get the salt back out.
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All combinations of a list of lists
...rapper function that takes a as input, iterates over itertools.product(*a) and yields both the tuple produced by itertools and a reverse version (e.g. create a list, reverse() it and convert back to tuple). Best ask a new question.
– Joachim Wagner
Feb 26 at 11...
How to show the last queries executed on MySQL?
...method to editing .cnf files because:
you're not editing the my.cnf file and potentially permanently turning on logging
you're not fishing around the filesystem looking for the query log - or even worse, distracted by the need for the perfect destination. /var/log /var/data/log /opt /home/mysql_s...
How best to determine if an argument is not sent to the JavaScript function
...ed' if one is paranoid (see comments).
Using the || operator has become standard practice - all the cool kids do it - but be careful: The default value will be triggered if the argument evaluates to false, which means it might actually be undefined, null, false, 0, '' (or anything else for which Bo...
My Git repository is in the wrong root directory. Can I move it? (../ instead of ./)
...ehow when I git init ed my latest project a month or so ago I ran the command in the directory one directory higher than the root of my project.
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Best way to add comments in erb
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i.e. there can't be any space between <% and #
– John Douthat
May 5 '10 at 22:30
How...
Should import statements always be at the top of a module?
...an prevent circular dependencies.
For example, if you have 2 modules, X.py and Y.py, and they both need to import each other, this will cause a circular dependency when you import one of the modules causing an infinite loop. If you move the import statement in one of the modules then it won't try to...