大约有 6,700 项符合查询结果（耗时：0.0304秒） [XML]
Rails find record with zero has_many records associated [duplicate]
... that particular case. I'm not sure what the efficiency is of doing a join vs doing an includes, though
share
|
improve this answer
|
follow
|
...
How to access environment variable values?
... @endolith, the correct question woud be "HOME" in os.environ vs os.environ.get('HOME') is None. As you can see first is far more readable & comfortable to work with.
– Konstantin Sekeresh
Oct 16 '19 at 13:43
...
Convert UTC date time to local date time
...rmatted string as shown above. msdn.microsoft.com/en-us/library/zdtaw1bw(v=vs.110).aspx In javascript it's new Date().toISOString(). developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Hulvej
Aug 4 '15 at 18:29
...
Remove DEFINER clause from MySQL Dumps
...here is related question: dba.stackexchange.com/questions/118846/mysqldump-vs-mysqlpump
– Scadge
Dec 8 '17 at 14:09
...
Perforce for Git users? [closed]
... full power of Perforce workspaces read Configuring P4.
Explicit Checkout vs. Implicit Checkout
One of the biggest challenges for users moving from Git to Perforce is the concept of explicit checkout. If you are accustomed to the Git/SVN/CVS workflow of changing files and then telling the version ...
Python speed testing - Time Difference - milliseconds
...
In the first example above, you are shown a time of 0.05 for time.clock() vs 0.06377 for time.time()
>>> start = time.clock(); time.sleep(1) ; print "process time: " + (time.clock() - start)
process time: 0.0
>>> start = time.time(); time.sleep(1) ; print "process time: " + (time...
Scala how can I count the number of occurrences in a list
...
@ohruunuruus this ought to be an answer (vs comment); i would love to enthusiastically upvote, if it were (and select it as the best answer if i were the OP);
– doug
Feb 13 '15 at 4:01
...
Entity Framework Refresh context?
...com/en-us/library/system.data.entity.infrastructure.dbentityentry.reload(v=vs.113).aspx#M:System.Data.Entity.Infrastructure.DbEntityEntry.Reload
share
|
improve this answer
|
...
Why is there no Tree class in .NET?
...om a Tree Data Stucture.
http://msdn.microsoft.com/en-us/library/f7fta44c(VS.80).aspx
share
|
improve this answer
|
follow
|
...
IndentationError: unindent does not match any outer indentation level
... Thank you! What a great tip. Error was identified by flake8 in VS Code but it could not identify where the problem was -- tabnanny did in a microsecond.
– Steve
Sep 26 '19 at 22:45
...