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How do I check if a SQL Server text column is empty?
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@ban-geoengineering SQL Server T-SQL doesn't honor short-circuit evaluation techniques, so order here doesn't effect the outcome.
– Conrad
Aug 3 '17 at 18:01
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Static extension methods [duplicate]
... methods on existing classes? You can just have your own helper class that does the same thing, so what's really the benefit in being able to do:
Bool.Parse(..)
vs.
Helper.ParseBool(..);
Doesn't really bring much to the table...
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IDENTITY_INSERT is set to OFF - How to turn it ON?
...er only allows one table to have IDENTITY_INSERT property set to ON.
This does not work:
SET IDENTITY_INSERT TableA ON
SET IDENTITY_INSERT TableB ON
... INSERT ON TableA ...
... INSERT ON TableB ...
SET IDENTITY_INSERT TableA OFF
SET IDENTITY_INSERT TableB OFF
Instead:
SET IDENTITY_INSERT Table...
Is mongodb running?
... I got this: 501 5365 418 0 4:10pm ttys000 0:00.00 grep mongo, does that mean it is running?
– L1ghtk3ira
May 27 '16 at 20:10
1
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How to remove remote origin from Git repo
...omment answer of @user1615903, so add this as answer:
"git remote remove" does not exist, should use "rm" instead of "remove".
So the correct way is:
git remote rm origin
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How to add include path in Qt Creator?
... simply list the paths you want to include, one per line. Really all this does is tell Qt Creator where to look for files to index for auto completion. Your own build system will have to handle the include paths in its own way.
As explained in the Qt Creator Manual, <your path> must be an a...
Javascript roundoff number to nearest 0.5
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What does inv mean? What's the inv variable represents?
– Deilan
Oct 22 '18 at 12:36
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count the frequency that a value occurs in a dataframe column
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In 0.18.1 groupby together with count does not give the frequency of unique values:
>>> df
a
0 a
1 b
2 s
3 s
4 b
5 a
6 b
>>> df.groupby('a').count()
Empty DataFrame
Columns: []
Index: [a, b, s]
However, the unique values and their ...
Difference between Covariance & Contra-variance
...he caller's code, just like a return value can. Usually this sort of thing doesn't come up, fortunately :)
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Update just one gem with bundler
...le update --source myself for a long time but there are scenarios where it doesn't work. Luckily, there's a gem called bundler-patch which has the goal of fixing this shortcoming.
I also wrote a short blog post about how to use bundler-patch and why bundle update --source doesn't work consistently....