大约有 44,000 项符合查询结果（耗时：0.0752秒） [XML]
What makes a SQL statement sargable?
...Date, even if one exists. It will literally have to evaluate this function for every row of the table. Much better to use:
WHERE myDate >= '01-01-2008' AND myDate < '01-01-2009'
Some other examples:
Bad: Select ... WHERE isNull(FullName,'Ed Jones') = 'Ed Jones'
Fixed: Select ... WHERE ((Fu...
How to vertically align elements in ?
...
Richard, thanks a lot for your help. i did not know about these display types. unfortunately they are not supported in IE7. i found a way to align the contents of each <li>: ampsoft.net/webdesign-l/vertical-aligned-nav-list.html but there se...
Efficient way to apply multiple filters to pandas DataFrame or Series
...
Pandas (and numpy) allow for boolean indexing, which will be much more efficient:
In [11]: df.loc[df['col1'] >= 1, 'col1']
Out[11]:
1 1
2 2
Name: col1
In [12]: df[df['col1'] >= 1]
Out[12]:
col1 col2
1 1 11
2 2 12
In...
AI2 Media Notification
...ved. Instead use extension UrsMediaHelper. Method SetMetaDataFromMH for getting metadata from an UrsMediaHelper component added. The directories returned by GetAppDataDir & GetDownloadDir close with "/". 1.2 (2021-09-12) If the extension is used in several apps...
If vs. Switch Speed
...
The compiler can build jump tables where applicable. For example, when you use the reflector to look at the code produced, you will see that for huge switches on strings, the compiler will actually generate code that uses a hash table to dispatch these. The hash table uses the ...
Are parallel calls to send/recv on the same socket valid?
...ese system APIs will behave. I am unable to find a good documentation also for the same.
3 Answers
...
Django connection to PostgreSQL: “Peer authentication failed”
...ostgreSQL, but decided to switch because the host I ultimately plan to use for this project does not have MySQL.
5 Answers
...
Why doesn't django's model.save() call full_clean()?
...t call 'full_clean' on a model unless it is being saved as part of a model form.
6 Answers
...
Set active tab style with AngularJS
...ht be tedious (if you've got many tabs) so this logic might be a candidate for a very simple directive.
share
|
improve this answer
|
follow
|
...
Is explicitly closing files important?
...ing practice to rely on the Python garbage-collection to close all files? For example, if one does this:
6 Answers
...