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postgresql COUNT(DISTINCT …) very slow
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Have you considered the effect of caching? If doing three "explain analyze" subsequently, the first one may be slow fetching things from disk while the two latter may be fast fetching from memory.
– tobixen
Jun 28 '12 at 18:45
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Align inline-block DIVs to top of container element
When two inline-block div s have different heights, why does the shorter of the two not align to the top of the container? ( DEMO ):
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With MySQL, how can I generate a column containing the record index in a table?
...but you'd normally use it to reference attributes of the derived table, as if it was a real table.
– Daniel Vassallo
Feb 27 '12 at 23:05
20
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How to search a string in multiple files and return the names of files in Powershell?
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What if you want to also MOVE those files?... I'm getting an error with this where I can't join a | Move-Item to the end of that.
– rud3y
Sep 5 '12 at 12:57
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What are the differences between the urllib, urllib2, urllib3 and requests module?
In Python, what are the differences between the urllib , urllib2 , urllib3 and requests modules? Why are there three? They seem to do the same thing...
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Java inner class and static nested class
What is the main difference between an inner class and a static nested class in Java? Does design / implementation play a role in choosing one of these?
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JavaScript: clone a function
... return that.apply(this, arguments); };
for(var key in this) {
if (this.hasOwnProperty(key)) {
temp[key] = this[key];
}
}
return temp;
};
alert(x === x.clone());
alert(x() === x.clone()());
alert(t === t.clone());
alert(t(1,1,1) === t.clone()(1,1,1));
alert(...
What is data oriented design?
...you might do operations that affects only part of a balls properties. E.g. if you combine the colors of all the balls in various ways, then you want your cache to only contain color information. However when all ball properties are stored in one unit you will pull in all the other properties of a ba...
What's the difference between tilde(~) and caret(^) in package.json?
... ~ assumes you can trust minor and point releases from your dependencies. If you are publishing a library and want other people to trust you, DO NOT BLINDLY ACCEPT DOWNSTREAM DEPENDENCIES. A bad dot release from your dependency can cause a chain reaction upstream, and will have people knocking at Y...
Java Persistence / JPA: @Column vs @Basic
What is the difference between @Column and @Basic annotations in JPA? Can they be used together? Should they be used together? Or does one of them suffice?
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