大约有 13,000 项符合查询结果（耗时：0.0213秒） [XML]
LEFT OUTER JOIN in LINQ
...c.Category equals p.Category into ps
from p in ps.DefaultIfEmpty()
select new { Category = c, ProductName = p == null ? "(No products)" : p.ProductName };
share
|
improve this answer
...
Hibernate Criteria returns children multiple times with FetchType.EAGER
....class)
.list();
List result = session.createQuery("select o from Order o left join fetch o.lineItems").list();
All of these examples produce the same SQL statement:
SELECT o.*, l.* from ORDER o LEFT OUTER JOIN LINE_ITEMS l ON o.ID = l.ORDER_ID
Want to know why th...
C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...float，double 或 DWORD 类型。但它不能应用于比较自负串（char* 指针），因为这个函数比较的是串指针，而不是字符串本身：
LPCTSTR s1,s2;
...
int cmp = compare(s1,s2); // s1<s2? Oops!
为了能进行字符串比较，你需要一个使用 strcmp 或其 TCH...
The selected run destination is not valid for this action
...ject icon in the left hand panel. 2) In the right hand panel that appears, select Build Settings » all. 3) You'll see the option to change the SDK. Screenshot: img546.imageshack.us/img546/9808/picture3fh.png
– cwd
Dec 16 '11 at 23:12
...
Installing Python 3 on RHEL
... As I said, the link in your answer contains non-printable unicode characters. When I copy/paste your link, here is what I see in VIM: https://dl.iuscommunity.org/pub/ius/stable/CentOS/6/x86_64/iu<200c><200b>s-release-1.0-14.ius.centos6.noarch.rpm Here is the unicode cha...
Converting file size in bytes to human-readable string
...rsion. Can you tell me, though, why you inserted the two invisible Unicode characters U+200C (ZERO WIDTH NON-JOINER) and U+200B (ZERO WIDTH SPACE) after the E oft EiB? Is this intended to be a watermark, so that you can track who used this code? If so, I think you should have made that transparent i...
How do I obtain a Query Execution Plan in SQL Server?
...ution plan in SQL Server Management Studio, or right click on the plan and select "Save Execution Plan As ..." to save the plan to a file in XML format.
Method 2 - Using SHOWPLAN options
This method is very similar to method 1 (in fact this is what SQL Server Management Studio does internally), ho...
Easiest way to detect Internet connection on iOS?
...std.h>
#include<netdb.h>
Code:
-(BOOL)isNetworkAvailable
{
char *hostname;
struct hostent *hostinfo;
hostname = "google.com";
hostinfo = gethostbyname (hostname);
if (hostinfo == NULL){
NSLog(@"-> no connection!\n");
return NO;
}
else{
...
Android List Preferences: have summary as selected value?
...ile. How would I set the summary of the list activity to the value that is selected?
11 Answers
...
How do I convert an interval into a number of hours with postgres?
...
Probably the easiest way is:
SELECT EXTRACT(epoch FROM my_interval)/3600
share
|
improve this answer
|
follow
|
...