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What are the options for storing hierarchical data in a relational database? [closed]
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My favorite answer is as what the first sentence in this thread suggested. Use an Adjacency List to maintain the hierarchy and use Nested Sets to query the hierarchy.
The problem up until now has been that the coversion method fr...
How to exit from PostgreSQL command line utility: psql
What command or short key can I use to exit the PostgreSQL command line utility psql ?
9 Answers
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Is it correct to use JavaScript Array.sort() method for shuffling?
...c as you say. In particular, I seem to remember that the standard library sorting from either Java or .NET (not sure which) can often detect if you end up with an inconsistent comparison between some elements (e.g. you first claim A < B and B < C, but then C < A).
It also ends up as a more ...
How do I declare a global variable in VBA?
.../Sub, not just outside: "Module-level variables can be declared with a Dim or Private statement at the top of the module above the first procedure definition." (from Scope of variables in Visual Basic for Applications)
– Nickolay
Jan 29 at 16:49
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How to redirect 'print' output to a file using python?
I want to redirect the print to a .txt file using python. I have a 'for' loop, which will 'print' the output for each of my .bam file while I want to redirect ALL these output to one file. So I tried to put
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How might I convert a double to the nearest integer value?
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Won't Convert.ToInt32() do the same thing, or does it simply strip everything after the decimal?
– The Muffin Man
May 25 '11 at 2:08
210
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Cannot delete or update a parent row: a foreign key constraint fails
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As is, you must delete the row out of the advertisers table before you can delete the row in the jobs table that it references. This:
ALTER TABLE `advertisers`
ADD CONSTRAINT `advertisers_ibfk_1` FOREIGN KEY (`advertiser_id`)
REFERENCES `jobs` (`advertiser_id`);
...is actual...
JavaScript - Get minutes between two dates
...oday); // milliseconds between now & Christmas
var diffDays = Math.floor(diffMs / 86400000); // days
var diffHrs = Math.floor((diffMs % 86400000) / 3600000); // hours
var diffMins = Math.round(((diffMs % 86400000) % 3600000) / 60000); // minutes
alert(diffDays + " days, " + diffHrs + " hours...
Cancel/kill window.setTimeout() before it happens
I have a few places where I use the line below to clear out a status, for example. I have a few of these that hang out for 10 seconds or more and if the user gets clicking around the action can occur at incorrect time intervals.
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How do you merge two Git repositories?
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A single branch of another repository can be easily placed under a subdirectory retaining its history. For example:
git subtree add --prefix=rails git://github.com/rails/rails.git master
This will appear as a single commit where all files of Rails master b...