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How do I use cascade delete with SQL Server?
I have 2 tables: T1 and T2, they are existing tables with data. We have a one to many relationship between T1 and T2. How do I alter the table definitions to perform cascading delete in SQL Server when a record from T1 is deleted, all associated records in T2 also deleted.
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Python extending with - using super() Python 3 vs Python 2
...r: global name '__class__' is not defined, and super(self.__class__) is erroneous as well. You must provide an instance as a second argument, which would suggest you need to do super(self.__class__, self), but that is wrong. If Class2 inherits from Class1 and Class1 calls super(self.__class__, self)...
What's this =! operator? [duplicate]
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That's two operators, = and !, not one. It might be an obfuscated way of writing
a = !b;
if (a) {
// whatever
}
setting a to the logical inverse of b, and testing whether the result is true (or, equivalently, whether b was false).
Or it might be a mist...
Is HttpClient safe to use concurrently?
In all the examples I can find of usages of HttpClient , it is used for one off calls. But what if I have a persistent client situation, where several requests can be made concurrently? Basically, is it safe to call client.PostAsync on 2 threads at once against the same instance of HttpClient .
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How to sort a dataframe by multiple column(s)
... z = c(1, 1, 1, 2))
library(taRifx)
sort(dd, f= ~ -z + b )
If you are one of the original authors of this function, please contact me. Discussion as to public domaininess is here: http://chat.stackoverflow.com/transcript/message/1094290#1094290
You can also use the arrange() function from p...
What's the safest way to iterate through the keys of a Perl hash?
...h may in some way have unintended side effects. So, is that true, and is one of the two following methods best, or is there a better way?
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Signtool error: No certificates were found that met all given criteria with a Windows Store App?
...install the missing certificate. Alternatively you can always create a new one and use that!
– JDandChips
Mar 16 '16 at 10:32
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Convert two lists into a dictionary
...rnandoWittmann. {thing} is syntactic sugar to construct a set() containing one element. {*iterable} is syntactic sugar to construct a set containing several elements. {k:v} or {**mapping} will construct a dict, but that's syntactically quite distinct.
– Dan Lenski
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Make .git directory web inaccessible
...llow,deny
Deny from all
But note, that it would be lost if you ever re-cloned the repository
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Google Maps: Auto close open InfoWindows?
... for me, because I am using an array of InfoWindow objects instead of just one that cycles through and grabs the pertinent info. Each InfoWindow has its own separately updating information, so I found this technique quite useful.
– InterfaceGuy
Jul 25 '12 at 21...