大约有 25,300 项符合查询结果（耗时：0.0347秒） [XML]
Join/Where with LINQ and Lambda
...ot errors:
var id = 1;
var query =
from post in database.Posts
join meta in database.Post_Metas on post.ID equals meta.Post_ID
where post.ID == id
select new { Post = post, Meta = meta };
If you're really stuck on using lambdas though, your syntax is quite a bit off. Here's the same q...
must appear in the GROUP BY clause or be used in an aggregate function
...with itself to get the additional columns you'd need to show:
SELECT m.cname, m.wmname, t.mx
FROM (
SELECT cname, MAX(avg) AS mx
FROM makerar
GROUP BY cname
) t JOIN makerar m ON m.cname = t.cname AND t.mx = m.avg
;
cname | wmname | mx
--------+--------+------...
Painless way to install a new version of R?
Andrew Gelman recently lamented the lack of an easy upgrade process for R (probably more relevant on Windows than Linux). Does anyone have a good trick for doing the upgrade, from installing the software to copying all the settings/packages over?
...
Practical uses for AtomicInteger
...
There are two main uses of AtomicInteger:
As an atomic counter (incrementAndGet(), etc) that can be used by many threads concurrently
As a primitive that supports compare-and-swap instruction (compareAndSet()) to implement non-blocking algorithms.
Here is an example of non-blocking random nu...
Invert “if” statement to reduce nesting
...
A return in the middle of the method is not necessarily bad. It might be better to return immediately if it makes the intent of the code clearer. For example:
double getPayAmount() {
double result;
if (_isDead) result = deadAmount();
else {
...
Outputting data from unit test in python
...ce what caused the error? I am aware of the ability to create a customized message, which can carry some information, but sometimes you might deal with more complex data, that can't easily be represented as a string.
...
Uninstall ReSharper 4.5
...ing but JetBrains....why to confuse users? it should be straight forward named "Resharper" or "ReSharper by jetbrains"or something :D ReSharper is nice but too expensive for a beginner or hobbyst...
– Saeid Yazdani
Nov 10 '11 at 8:02
...
Exclude all transitive dependencies of a single dependency
In Maven2, to exclude a single transitive dependency, I have to do something like this:
12 Answers
...
Best way to trim strings after data entry. Should I create a custom model binder?
...'m using ASP.NET MVC and I'd like all user entered string fields to be trimmed before they're inserted into the database. And since I have many data entry forms, I'm looking for an elegant way to trim all strings instead of explicitly trimming every user supplied string value. I'm interested to k...
What is the fastest or most elegant way to compute a set difference using Javascript arrays?
...nce he stated that "Gecko-specific tricks are okay" but I think it's worth mentioning.
– Eric Bréchemier
Nov 13 '09 at 16:44
45
...