Dolphindb distinct
WebApr 11, 2024 · 本系列文章将会介绍如何使用DolphinDB优雅而高效地实现量化交易策略回测。. 本文将介绍在华尔街广泛应用的多因子Alpha策略的回测。多因子模型是量化交易选股中最重要的一类模型，基本思路是找到某些和回报率最相关的指标，并根据这些指标，构建股票投资组合（做多正相关的股票，做空负相关 ... WebThe SQL keyword distinct supports distributed queries to access data from DFS tables. The SQL keyword distinct differs from the distinct function in that the latter does not …
Dolphindb distinct
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WebWith its superior columnar time-series database, DolphinDB allows you to ingest, store and analyze IoT data from up to hundreds of millions of sensors, at any measurement frequency up to nanosecond whilst maintaining extremely high levels of performance. Real-time Analytics. DolphinDB provides a comprehensive set of convenient tools to analyze ... http://duoduokou.com/sql/40863855555549419430.html
WebOct 29, 2024 · There’s a popular misconception that “1” in COUNT(1) means “count the values in the first column and return the number of rows.” From that misconception follows a second: that COUNT(1) is faster because it will count only the first column, while COUNT(*) will use the whole table to get to the same result.. This is not true. The number in the … WebHow to use DolphinDB image. For starters, if you want to experience the DolphinDB server at a quick speed, we recommand you enter the following code on your computer: $ docker pull dolphindb/dolphindb: {tagname} && docker run -itd -p 8848:8848 --name dolphindb dolphindb/dolphindb: {tagname} sh. Please choose the specific image that you want to ...
WebVerified email at dolphindb.com. Data Mining Text Mining Information Retrieval Machine Learning. Articles Cited by Co-authors. Title. Sort. Sort by citations Sort by year Sort by title. Cited by. Cited by. Year; Exploiting wikipedia as external knowledge for document clustering. X Hu, X Zhang, C Lu, EK Park, X Zhou. WebSep 20, 2024 · 华夏基金对市面上多家数据库进行调研测试，从性能、语言学习成本和技术服务等多方面进行综合考量，最终选择高性能时序数据库 DolphinDB。本文将分享华夏基 …
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WebDec 4, 2024 · DolphinDB is a super-fast distributed time-series database that offers powerful computing capabilities. DolphinDB has been widely used in quantitative finance, IoT, and various other fields that ... mw2 calling cards warzoneWebApr 7, 2024 · SQL Server에서 'Pivot'을 사용하여 행을 열로 변환 MS 피벗 테이블에 있는 내용을 읽었는데, 아직 수정에 문제가 있습니다. 작성 중인 임시 테이블이 있습니다. 1열은 상점 번호, 2열은 주 번호, 마지막으로 3열은 합계가 됩니다.또한 Week 번호는 동적이며 스토어 번호는 정적입니다. mw2 burger king codeshttp://www.studyofnet.com/989626700.html how to organise a clothes swapWebDolphinDB database supports dynamic loading of external plugins to extend system functionality. The plug-in can be written in C++, and it needs to be compiled into ".so" … how to organise a conferenceWeb下面我们将介绍如何在DolphinDB中测试动量交易策略，并计算动量交易策略的累积回报。 DolphinDB database 是一款高性能分布式时序数据库。 与其它通常的数据库不同，DolphinDB不仅可以存储和检索数据，而且具备强大的编程和分析功能，可以直接在数据库内完成策略 ... how to organise a conference callWebDolphinDB JavaScript API is a JavaScript library that encapsulates the ability to operate the DolphinDB database, such as: connecting to the database, executing scripts, calling … how to organise a community easter egg huntWeb企业在使用大数据分析平台时，首先需要把海量数据从多个数据源迁移到大数据平台中。在导入数据前，我们需要理解 DolphinDB database 的基本概念和特点。DolphinDB数据表 … mw2 camos bugged