大约有 41,000 项符合查询结果（耗时：0.0586秒） [XML]
Is it possible to change a UIButtons background color?
...IControlStateDisabled];
[myButton setBackgroundImage:[UIImage imageNamed:@"selected.png"] forState:UIControlStateSelected];
[myButton setBackgroundImage:[UIImage imageNamed:@"higligted.png"] forState:UIControlStateHighlighted];
[myButton setBackgroundImage:[UIImage imageNamed:@"highlighted+selected....
What is SELF JOIN and when would you use it? [duplicate]
...et information for both people in one row, you could self join like this:
select e1.EmployeeID,
e1.FirstName,
e1.LastName,
e1.SupervisorID,
e2.FirstName as SupervisorFirstName,
e2.LastName as SupervisorLastName
from Employee e1
left outer join Employee e2 on e1.SupervisorID ...
In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
...ave DATE, DATETIME, TIME and TIMESTAMP column data types; just as you have CHAR, VARCHAR, FLOAT and INTEGER.
So, you ask, what's the difference? Well, some of them are self-explanatory. DATE only stores a date, TIME only stores a time of day, while DATETIME stores both.
The difference between DATE...
How to remove a Gitlab project?
...
Go to the project page
Select "Settings"
Select the "General" section (you must be in the repository you want to delete to delete it)
If you have enough rights, then at the bottom of the page will be a button for "Advanced settings" (i.e. project s...
Literal suffix for byte in .NET?
...t
does 0xFFB mean?) and even if we had a solution for that, or another
character than 'B' ('Y' was considered, F# uses this) no one could
remember whether the default was signed or unsigned - .NET bytes are
unsigned by default so it would make sense to pick B and SB but all
the other suffi...
Naming of ID columns in database tables
...!)and forget to change the alias in the join condition.
So you now have
select t1.field1, t2.field2, t3.field3
from table1 t1
join table2 t2 on t1.id = t2.table1id
join table3 t3 on t1.id = t3.table2id
when you meant
select t1.field1, t2.field2, t3.field3
from table1 t1
join table2 t2 on t1...
Extracting specific columns in numpy array
...
I assume you wanted columns 1 and 9?
To select multiple columns at once, use
X = data[:, [1, 9]]
To select one at a time, use
x, y = data[:, 1], data[:, 9]
With names:
data[:, ['Column Name1','Column Name2']]
You can get the names from data.dtype.names…
...
Is it safe to use -1 to set all bits to true?
... on datasets of N bits by breaking it down into chunks of sizeof(unsigned)*CHAR_BIT bits each.
– MSalters
May 4 '09 at 7:22
2
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iPhone app signing: A valid signing identity matching this profile could not be found in your keycha
...
Open Xcode. Click WINDOW > ORGANIZER. Then click the Devices tab and select "Provisioning Profiles" on the left.
That should bring up your provisioning profiles. Highlight one by one (if more than 1), right click and delete profile. Yes, just do it! Delete them all! (I kept making a new one a...
How do I export a project in the Android studio?
...
Now "android:debuggalbe=false" is not needed and you can select build type when exporting a signed APK.
– echo
Sep 4 '14 at 10:28
4
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