大约有 42,000 项符合查询结果（耗时：0.0261秒） [XML]
Is having an 'OR' in an INNER JOIN condition a bad idea?
...LECT *
FROM maintable m
JOIN othertable o
ON o.parentId = m.id
UNION
SELECT *
FROM maintable m
JOIN othertable o
ON o.id = m.parentId
, each of them being an equijoin, however, SQL Server's optimizer is not smart enough to see it in the query you wrote (though they are logi...
Can someone give an example of cosine similarity, in a very simple, graphical way?
...e1)
counter2 = Counter(iterable2)
all_items = set(counter1.keys()).union(set(counter2.keys()))
vector1 = [counter1[k] for k in all_items]
vector2 = [counter2[k] for k in all_items]
return vector1, vector2
def cosim(v1, v2):
dot_product = sum(n1 * n2 for n1, n2 in zip(v1, v2)...
How to use Git properly with Xcode?
...add this line to a .gitattributes file:
*.pbxproj text -crlf -diff -merge=union
Then git will always take both sides of a merge for the .pbxproject files, having the same effect as the script I provided only without any extra work.
Lastly, here is my complete .gitignore file, showing what I do h...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Server.MapPath("~/file/bookstore.xml"));
二、具体实例
在C#.net中如何操作XML需要添加的命名空间：
using System.Xml;
定义几个公共对象：
XmlDocument xmldoc;
XmlNode xmlnode;
XmlElement xmlelem;
1，创建到服务器同名目录下的xml文件：
方法一：
...
C++ protobuf使用入门实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...singleton enumeration to represent the null value for the
// `Value` type union.
//
// The JSON representation for `NullValue` is JSON `null`.
enum TestNullValue {
// Null value.
NULL_VALUE = 0;
}
// `ListValue` is a wrapper around a repeated field of values.
//
// The JSON represen...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...option, enabled by default.
When address of packed member of struct or union is taken, it may
result in an unaligned pointer value. This patch adds
-Waddress-of-packed-member to check alignment at pointer assignment and warn unaligned address as well as unaligned pointer
I've just built t...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
... 发送和接收文本 (URSAI2UDPTest)
此示例展示了如何发送和接收文本。
示例中的块并不难理解。大多数块涉及输入项的验证。
发送和接收字节数组 (UDPBinaryTest)
此示例展示了如何发送和接收字节...
Importing from builtin library when module with same name exists
... f.close()
except:
pass
Example
I wanted to import mysql.connection, but I had a local package already called mysql (the official mysql utilities). So to get the connector from the system mysql package, I replaced this:
import mysql.connector
With this:
import sys
from my...
Homebrew: List only installed top level formulas
...
Thanks! However this does show mysql as if it's not required by anything while it's actually required on my system by mysql-connector-c++. Do you happen to know if this is intentional (like if brew is keeping which formulae is installed directly not only i...
file_put_contents - failed to open stream: Permission denied
...ld now, but there's no need to manually write queries to a file like this. MySQL has logging support built in, you just need to enable it within your dev environment.
Take a look at the documentation for the 'general query log':
http://dev.mysql.com/doc/refman/5.1/en/query-log.html
...