大约有 40,000 项符合查询结果（耗时：0.0509秒） [XML]
Efficiently convert rows to columns in sql server
... yourtable
group by ColumnName, id
order by id
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = N'SELECT ' + @cols + N' from
(
select value, ColumnName
fr...
Extracting bits with a single multiplication
...acent to each other in the original, AND you want to keep them in the same order, then you can still do it. And for the purpose of the (N-1) rule they count as two bits.
There is another insight - inspired by the answer of @Ternary below (see my comment there). For each interesting bit, you only n...
Understanding Python super() with __init__() methods [duplicate]
... will call the correct next parent class function in the Method Resolution Order (MRO).
In Python 3, we can call it like this:
class ChildB(Base):
def __init__(self):
super().__init__()
In Python 2, we are required to use it like this:
super(ChildB, self).__init__()
Without super...
composer: How to find the exact version of a package?
...
I know it's an old question, but...
composer.phar show
Will show all the currently installed packages and their version information. (This was shown in previous versions of Composer only when using the now-deprecated -i option.)
To see more details, specify the name of the package as wel...
Why is semicolon allowed in this python snippet?
...ot warrant the use of semicolons to end statements.
So why is this (below) allowed?
15 Answers
...
Formatting Phone Numbers in PHP
...etter in the future. The comment you reference seems to have been deleted. All is well. Happy holidays.
– Stoutie
Dec 24 '16 at 5:16
add a comment
|
...
When should I use a composite index?
...ry, must use a single index for all where-clause, table join, group-by and order-by. So a separate index on each column may not work always but a composite index can do the magic.
– AKHIL MATHEW
Jul 25 at 13:39
...
What's quicker and better to determine if an array key exists in PHP?
...
@FrancescoPasa Well, "search for the keys" is what PHP documentation says. Other than that, I can't tell if "search" to them means something completely different to what it means to me.
– Rain
Apr 22 at 6:09
...
What are the advantages of Sublime Text over Notepad++ and vice-versa? [closed]
...
Upgrade Policy
A license is valid for Sublime Text 3, and includes all
point updates, as well as access to prior versions (e.g., Sublime Text
2). Future major versions, such as Sublime Text 4, will be a paid
upgrade.
This licensing requirement is still correct as of Dec 2019.
...
What is the difference between a static and a non-static initialization code block
...lock is an instance initializer.
Class initializers are executed in the order they are defined (top down, just like simple variable initializers) when the class is loaded (actually, when it's resolved, but that's a technicality).
Instance initializers are executed in the order defined when the c...