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How do I find a “gap” in running counter with SQL?
...have a table with 2 million rows that has gaps, so I will need to slice it into smaller pieces and run some SQL on it). I suppose I could run one query to find the start of a gap, then another to find the end of a gap, and them "merge sort" the two sequences.
– Hamish Grubijan
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Why does AuthorizeAttribute redirect to the login page for authentication and authorization failures
...ates that the server understood the request but refuses to authorize it.
Interestingly enough, at the time ASP.NET MVC 1 was released the behavior of AuthorizeAttribute was correct. Now, the behavior is incorrect - the HTTP/1.1 specification was fixed.
Rather than attempt to change ASP.NET's logi...
Getting thread id of current method call
Is there a way to print out the current thread id on which the current method is executing on?
6 Answers
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When to use “ON UPDATE CASCADE”
...something that doesn't exist in the parent table (and you have referential integrity), you should get a foreign key error.
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Modify tick label text
... this won't work. I'm not sure what the problem is yet... It may be an unintended change, or it may not be...
Normally, you'd do something along these lines:
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
# We need to draw the canvas, otherwise the labels won't be positioned and
# w...
how to exclude null values in array_agg like in string_agg using postgres?
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I am adding this even though this this thread is quite old, but I ran into this neat trick that works quite well on small arrays. It runs on Postgres 8.4+ without additional libraries or functions.
string_to_array(array_to_string(array_agg(my_column)))::int[]
The array_to_string() method act...
How to add a progress bar to a shell script?
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Write \n when you're done to advance the line.
Use echo -ne to:
not print \n and
to recognize escape sequences like \r.
Here's a demo:
echo -ne '##### (33%)\r'
sleep 1
echo -ne '############# (66%)\r'
sleep 1
echo -ne '####################### (100%)\r'
echo ...
Anyone else find naming classes and methods one of the most difficult parts in programming? [closed]
...ds, SQL stored procs, etc. By keeping with this syntax, it will keep your Intellisense/Code Panes much more neat. So you want EmployeeGetByID() EmployeeAdd(), EmployeeDeleteByID(). When you use a more grammatically correct syntax such as GetEmployee(), AddEmployee() you'll see that this gets real...
xpath find if node exists
...y often use count(/html/body) = 0, as the specific number of nodes is more interesting than the set. For example... when there is unexpectedly more than 1 node that matches your expression.
<xsl:choose>
<xsl:when test="/html/body">
<!-- Found the node(s) -->
<...
No output to console from a WPF application?
...reeConsole();
[DllImport(Kernel32_DllName)]
private static extern IntPtr GetConsoleWindow();
[DllImport(Kernel32_DllName)]
private static extern int GetConsoleOutputCP();
public static bool HasConsole
{
get { return GetConsoleWindow() != IntPtr.Zero; }
}
/...