Window function是OLAP的查询中比较常见的SQL construct,提供了“引用临近区域元组”的语义,这种语义使得一些分析型query的编写更加简单,可以避免不必要的相关子查询结构。此外,很多系统(Oracle/PolarDB) 内部也实现了用window function做subquery unnesting,避免相关子查询的低效执行,因此windo
"Efficient Processing of Window Functions in Analyti- cal SQL Queries". In: Proceedings of the VLDB Endowmen 8.10 (June 2015), pp. 1058-1069.Viktor Leis, Kan Kundhikanjana, Alfons Kemper, and Thomas Neumann. "Efficient processing of window functions in analytical SQL queries." Proc. VLDB ...
Presentation:SQL For Data Warehousing and Analysis: What's New In Oracle Database 18c(PDF) Alsonew in 18c for:Analytic Viewswhich organize data using a dimensional model. They provide a fast and efficient way to create analytic queries over data stored in existing database tables and views. ...
Presentation:SQL For Data Warehousing and Analysis: What's New In Oracle Database 18c(PDF) Alsonew in 18c for:Analytic Viewswhich organize data using a dimensional model. They provide a fast and efficient way to create analytic queries over data stored in existing database tables and views. ...
• Learn how MariaDB's distributed SQL implementation, Xpand, takes database elasticity, scale and high availability to the next level • Discover how you can use columnar indexing with distributed SQL to dramatically improve the execution speed of analytical queries on massive datasets...
MAQL is not SQL Having a SQL background helps to get on board with MAQL, but you will soon discover that MAQL is a more powerful yet streamlined analytical language. For example, there are no joins , you can reuse your MAQL queries and, as you will see, the use of syntax is more ...
normalize the queries to use only standard SQL - they will not use any advantages of ClickHouse but will be runnable on every system. ideally make it automated. At least make it simple - runnable by a short shell script that can be run by copy-pasting a few commands in the terminal, in...
Recently a SQL-like query language XRQL is proposed to query XML data. The XRQL queries capture the flavour of SQL queries while offering constructs for navigation, XML data construction and grouping. This study shows how OLAP queries can be expressed by using XRQL in a natural way and ...
DuckDB is an embedded SQL database known for high-performance analytical processing. Unlike PostgreSQL, which is a full-featured relational database management system, DuckDB is optimized for analytical queries in local environments. Integrating DuckDB with PostgreSQL enables you to leverage DuckDB’s an...
For example, if you used your data analytics skills in a finance internship, you could write: Used SQL queries to extract data and create reports that helped the team decrease surplus spending by 13% MoM. Even if you’re talking about soft skills, you should include the impact your skills...