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MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...x仿关系型数据库例子，通过BsonJavaScript脚本实现。相当的SQL：select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate
namespace MongoGroupDemo
{
class Program
{
private static string Mongo...
PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...要Map和Reduce两步即可，这里有一个PDF文档生动的说明了MySQL中GROUP BY和MongoDB中MapReduce的对应关系：
SQL to MongoDB
此外，还有很多资料可供参考，如：MongoDB Aggregation III: Map-Reduce Basics。
说明：软件版本为MongoDB 1.6.5，PECL Mongo 1.1....
VBA读写UTF8文本文件，VBA生成UTF-8无BOM格式的文件 - 更多技术 - 清泛网 -...
...ect("ADODB.Stream")
nameto = "指定一个文件全路径 如：“D:\1.sql”"
With WriteStream
.Open
.Charset = "UTF-8"
.Type = 2 'adTypeText （文本）
.WriteText ("insert into name values('1','2','3')")
.Position = 3
End With
With BinSt
....
Linq 多字段排序，二次排序 - .NET(C#) - 清泛IT论坛，有思想、有深度
Linq：ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );
类似SQL：select * from t1 order by f1 desc ,f2 asc
这种写法里 OrderBy、ThenBy 是升序的，OrderByDescending、ThenByDescending 是降序的。
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...获取手机等设备软硬件、版本等相关信息
【数据库】 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎
第三方拓展
【ASCII编解码】AsciiConversion 拓展
【文件】FileTools 拓展：提供额外的更强大的文件相关操作
【...
【持续更新】App Inventor 2 中文拓展一览 - App Inventor 2 中文网 - 清泛...
...：获取手机等设备软硬件、版本等相关信息
【数据库】 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎
第三方拓展
工具
【ASCII编解码】AsciiConversion 拓展
【动态创建】DynamicComponents 拓展：动态创建AI2组件对象
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Get the first element of each tuple in a list in Python [duplicate]
An SQL query gives me a list of tuples, like this:
5 Answers
5
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How to highlight text using javascript
...t-search or Lucene], then you can escape every character with \ and add an SQL-escape-statement, that way you'll find special characters that are LIKE-expressions.
e.g.
WHERE textField LIKE CONCAT('%', @query, '%') ESCAPE '\'
and the value of @query is not '%completed%' but '%\c\o\m\p\l\e\t\e\d%'
(...
Convert String[] to comma separated string in java
...in(names,"','") + "'"; this would give you the Single quotes needed by the SQL request.
– haysclark
Feb 26 '16 at 4:22
...
Best Practices: Salting & peppering passwords?
...o control over the server/code. This situation is not uncommon: aside from SQL-injection, also thrown away backups, discarded servers… can lead to this situation. A lot of PHP users work on hosted servers.
– martinstoeckli
Jun 4 '13 at 20:14
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