大约有 43,000 项符合查询结果（耗时：0.0319秒） [XML]
How to select only the first rows for each unique value of a column
...duplicate row. It will also give you the bit-type columns, and it works at least in MS Sql Server.
(select cname, address
from (
select cname,address, rn=row_number() over (partition by cname order by cname)
from customeraddresses
) x
where rn = 1) order by cname
If you want to find all...
Objective-C: Where to remove observer for NSNotification?
...he best general advice I can come up with: to protect your app. against at least one possible failure, do the removeObserver: dance in dealloc, since that's the last point (in the object's life), where you can do that cleanly. What this does not mean is: "just defer the removal until dealloc is call...
Why are two different concepts both called “heap”?
...erences to open blocks of memory was a min heap. Seems like it would be at least a decent way of quickly finding the smallest block of memory that would allow you to store the data you were trying to store Update: What I said sounds exactly like buddy blocks en.wikipedia.org/wiki/Dynamic_memory_allo...
Pragma in define macro
...addendum to a type signature, and some, like MSC add it as a prefix (or at least it did once, its been years since I've used MSC). Having bracketing contructs allows you to define something that always works, even if you have to pass the entire type signature into a compiler construct.
Of course, i...
Fast way to discover the row count of a table in PostgreSQL
...stimates can be greater than the actual row count for various reasons. Not least, deletes may have happened in the meantime.
– Erwin Brandstetter
Dec 3 '15 at 8:16
2
...
Undoing accidental git stash pop
...ase) that are proving hard to track down. I ran git stash show , so I at least know which files were changed. If nothing else, I guess this is a lesson to commit more.
...
Comparing two byte arrays in .NET
... P/Invoke yaay - this proved to be fastest by far on bitmaps at least: stackoverflow.com/questions/2031217/…
– Erik Forbes
Jan 10 '10 at 20:48
26
...
How does free know how much to free?
...s slightly more than this, and includes extra information that records (at least) how big the block is. You can't (reliably) access that other information - and nor should you :-).
When you call free(), it simply looks at the extra information to find out how big the block is.
...
Init method in Spring Controller (annotation version)
... If you have to initialize all beans and autowire/inject them there are at least two ways that I know of that will ensure this. I have only testet the second one but I belive both work the same.
If you are using @Bean you can reference by initMethod, like this.
@Configuration
public class BeanCon...
What does MissingManifestResourceException mean and how to fix it?
...e of the Default Namespace in the project properties (Application tab), at least for WinForms.
– TrueWill
Oct 12 '10 at 21:17
2
...