23.Basics of Relational Algebra 数据库管理 头狼迷彩 0 0 11.Database System Architecture - Part 1 头狼迷彩 0 0 21.Schema Diagrams 数据库管理 头狼迷彩 0 0 17.Codd’s 12 Rules (13 Rules) 数据库管理 头狼迷彩 0 0 18.Database Schema 数据库管理 头狼迷彩 0 0 14.Database Languages ...
百度试题 题目中国大学MOOC: Relational algebra consists of six basic operations: select, ___, union, set difference, cartesian product, and rename.相关知识点: 试题来源: 解析 project
SELECT DISTINCT [user_id] FROM ancestor WHERE [user_id] NOT IN ( SELECT DISTINCT cp.[user_id] FROM (SELECT a.[user_id],s.ancestry FROM ancestor a, ancestry_set s GROUP BY a.[user_id],s.ancestry) cp LEFT JOIN ancestor a ON cp.[user_id]=a.[user_id] AND cp...
Results on Automobile price dataset Expand table myindexmycolnames 1 symboling 2 normalized-losses 3 makeTechnical notesIf you are familiar with relational databases, this module creates a projection of the data; hence the original name, Project Columns. In database terms, a projection is a...
Results on Automobile price dataset Expand table myindexmycolnames 1 symboling 2 normalized-losses 3 makeTechnical notesIf you are familiar with relational databases, this module creates a projection of the data; hence the original name, Project Columns. In database terms, a pr...
1symboling 2normalized-losses 3make Technical notes If you are familiar with relational databases, this module creates aprojectionof the data; hence the original name,Project Columns. In database terms, a projection is a function, such as a Transact-SQL or LINQ statement, that takes a data ...
1symboling 2normalized-losses 3make Technical notes If you are familiar with relational databases, this module creates aprojectionof the data; hence the original name,Project Columns. In database terms, a projection is a function, such as a Transact-SQL or LINQ statement, that takes a data ...