大约有 32,000 项符合查询结果（耗时：0.0505秒） [XML]
Null coalescing in powershell
...f ($a) { $b } else { $c } }
$x = IfTrue ($myval -eq $null) "" $otherval
Then combine that is Powershell's ability to declare aliases that look a bit like operators, you end up with:
New-Alias "??" Coalesce
$s = ?? $myval "new value"
New-Alias "?:" IfTrue
$ans = ?: ($q -eq "meaning of life") 4...
Check a radio button with javascript
...think that's what most people need to select a group of radios by name and then based on value check one of them.
– Ndm Gjr
Apr 11 '19 at 23:57
...
Oracle SELECT TOP 10 records
...2.2009')
If HISTORY_DATE really is a date column and if it has an index then this rewrite will perform better:
WHERE HISTORY_DATE = TO_DATE ('06.02.2009', 'DD.MM.YYYY')
This is because a datatype conversion disables the use of a B-Tree index.
...
Why was the switch statement designed to need a break?
...
If cases were designed to break implicitly then you couldn't have fallthrough.
case 0:
case 1:
case 2:
// all do the same thing.
break;
case 3:
case 4:
// do something different.
break;
default:
// something else entirely.
If the switch was desi...
How to put an image in div with CSS?
...
If you are trying to avoid fixed sizes, then the easiest way is to use the plain img tag. What are you trying to accomplish with this? Maybe there's another solution programatically, like getting the image size via PHP getimagesize and then echo a corresponding sty...
Read and overwrite a file in Python
...hen passed inplace=1, it will move the file to a temporary location first, then write a new file to the old filename path. This move operation is fast on unix filesystems, because it just moves the filesystem inode, not the full contents. Then you can read & process each line individually to a...
How to get current memory usage in android?
...lculate total memory only once. so call point 1 only once in your code and then after, you can call code of point 2 repetitively.
share
|
improve this answer
|
follow
...
Python try…except comma vs 'as' in except
...too. But the syntax was confusing; you'd use except NameError, ValueError: then wondered why the ValueError exception was never being caught. Or used except (NameError, e): and were left with a NameError for 'e'!
– Martijn Pieters♦
Dec 14 '13 at 11:41
...
MySQL DISTINCT on a GROUP_CONCAT()
...T);
INSERT INTO numbers VALUES
(1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
then we can run this query:
SELECT
SUBSTRING_INDEX(
SUBSTRING_INDEX(tableName.categories, ' ', numbers.n),
' ',
-1) category
FROM
numbers INNER JOIN tableName
ON
LENGTH(tableName.categories)>=
LE...
Exclude folders from Eclipse search
...o create a new Working Set with the what you want searched (or Add All and then remove the ones you want filtered
share
|
improve this answer
|
follow
|
...