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How to drop a PostgreSQL database if there are active connections to it?
...our DB
AND procpid <> pg_backend_pid();
Once you disconnect everyone you will have to disconnect and issue the DROP DATABASE command from a connection from another database aka not the one your trying to drop.
Note the renaming of the procpid column to pid. See this mailing list thread.
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SQL Server loop - how do I loop through a set of records
...about them. Observe the performance and decide. This answer (cursors) is one possible choice. You can also use a WHILE LOOP, CTE, etc.
– Chains
Dec 18 '13 at 16:09
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What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
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Good for: Nothing really. There isn't anything BMP excels at, or isn't done better by other formats.
GIF - Lossless / Indexed only
GIF uses lossless compression, meaning that you can save the image over and over and never lose any data. The file sizes are much smaller than BMP, because go...
How do I change selected value of select2 dropdown with JqGrid?
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This is an acceptable solution only if one doesn't have any custom actions binded to the change event (like reloading the form). Otherwise those actions would be called redundantly upon triggered change().
– van_folmert
Feb 2...
How do I capture the output into a variable from an external process in PowerShell?
...e in the other scenarios, $cmdOutput is always a collection, even if only one object is output. Specifically, an instance of the array-like [System.Collections.ArrayList] type is returned.
See this GitHub issue for a discussion of this discrepancy.
To capture the output from multiple commands, use...
What is the string length of a GUID?
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@Shimmy - Look at the first one 'Hypenated, the same as default'
– stevehipwell
Dec 17 '10 at 9:24
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Is it possible to forward-declare a function in Python?
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+1 most direct answer, with the keystone concept: Pascal=define higher, Python=define earlier.
– Bob Stein
Oct 26 '14 at 16:20
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LaTeX table positioning
...acement option (e.g. \begin{table}[H]) to make sure it doesn't get repositioned.
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How can I extend typed Arrays in Swift?
...lt
}
}
Adding these two methods to the Array class allows me to call one of the two methods on an array and successfully remove duplicates. Note that the elements in the array must conform to the Hashable protocol. Now I can do this:
var dupes = ["one", "two", "two", "three"]
let deDuped = ...
How can I validate a string to only allow alphanumeric characters in it?
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@Phil. Maybe, but by then I will be delegating to someone who knows regular expressions ;-)
– Sentinel
Oct 2 '15 at 10:29
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