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Using psql how do I list extensions installed in a database?
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FROM pg_catalog.pg_extension e
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = e.extnamespace
LEFT JOIN pg_catalog.pg_description c ON c.objoid = e.oid AND c.classoid = 'pg_catalog.pg_extension'::pg_catalog.regclass
ORDER BY 1;
Thanks to https://blog.dbi-services.com/listing-the-extensions-avai...
Xcode — what is $(SRCROOT)?
... $(SRCRoot). But there is no /Users/stevew directory on my computer. So did it somehow get locked in to the location on the other computer?
– William Jockusch
Sep 15 '10 at 15:45
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How to get the last element of a slice?
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Thanks a bunch! Even though it does seem silly they didn't add the -1 index Python has...
– Morgan Wilde
Mar 20 '14 at 15:00
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Convert Dictionary to semicolon separated string in c#
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
Is it possible to use jQuery .on and hover?
... //stuff to do on mouse leave
}
});
According to the answers provided below you can use hover with .on(), but:
Although strongly discouraged for new code, you may see the
pseudo-event-name "hover" used as a shorthand for the string
"mouseenter mouseleave". It attaches a single even...
Best way to convert IList or IEnumerable to Array
...callers do know it, make the method generic and try this:
public static void T[] PerformQuery<T>()
{
IEnumerable query = ...;
T[] array = query.Cast<T>().ToArray();
return array;
}
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Method to Add new or update existing item in Dictionary
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I know it is not Dictionary<TKey, TValue> class, however you can avoid KeyNotFoundException while incrementing a value like:
dictionary[key]++; // throws `KeyNotFoundException` if there is no such key
by using ConcurrentDictionary<TKey, TValue> and its really nice method AddOrUpdate...
How is “mvn clean install” different from “mvn install”?
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"install" is a phase of the
default lifecycle
http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html#Lifecycle_Reference
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Can a pointer to base point to an array of derived objects?
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As Martinho Fernandes said, the indexing is wrong. If you wanted instead to store an array of Shapes, you would have to do so using an array of Shape *'s, like so:
int main()
{
Shape ** shapes = new Shape*[10];
for (int i = 0; i < 10; ++i)...
Set cookie and get cookie with JavaScript [duplicate]
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The eraseCookie function didn't work for me (FireFox Developer Edition 66.0b4). Instead, I had to use the code from B T's answer: document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/'.
– ban-geoengineering
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