大约有 45,000 项符合查询结果（耗时：0.0893秒） [XML]
How to implement a unique index on two columns in rails
I have a table and I'm trying to add a unique index on two columns. Those columns are also indexed. So my question is if I just can remove the indexes who were just for one column or if I have to use all three indexes:
...
How can I filter a Django query with a list of values?
...
@OmkarDeshpande No
– DylanYoung
Nov 8 '18 at 16:47
@Dy...
How to add one day to a date? [duplicate]
...boundaries. Make sure you are calling getTime() on your Calendar instance, and not get(...). Also note that months are from 0-11, but days are from 1-31.
– Daniel Rikowski
Jan 30 '18 at 10:37
...
Running python script inside ipython
...
best answer for simplicity and conciseness
– Evhz
Feb 14 at 13:32
Synt...
Access Asset Catalog programmatically
I know it's a new feature and this may not be possible, but I would love to be able to use an Asset Catalog to organize my assets, but I access all of my images programmatically. How would I access my images, now? Do I still access them by their file names like so:
...
How do I convert a NSString into a std::string?
I have an NSString object and want to convert it into a std::string .
3 Answers
3
...
How to detect if a specific file exists in Vimscript?
...ob if you don't care about readability.
– Sumudu Fernando
Apr 28 '12 at 21:20
8
if filereadable(e...
Xcode — what is $(SRCROOT)?
...ation where a.xcodeproj is.
It is simple to check, just put it in a field and Xcode gives you a tip
share
|
improve this answer
|
follow
|
...
SVN encrypted password store
I installed SVN on a Ubuntu machine and I can't get my head around something.
3 Answers
...
Crontab Day of the Week syntax
...
0 and 7 both stand for Sunday, you can use the one you want, so writing 0-6 or 1-7 has the same result.
Also, as suggested by @Henrik, it is possible to replace numbers by shortened name of days, such as MON, THU, etc:
0 - Su...