Dictionary:Dictionary Encoding的思路就是通过一个映射(字典)来把值映射成一些紧凑的编码。Dictionary的粒度可以是整个Table,也可以是类似IBM BLINK那样的per-page dictionary。这种压缩方式可以把变长的string映射成定长的字段(当然要string有重复的时候才能用,否则还不如存offset)。通过Dictionary把column转化成定长的数组,...
PROBLEM TO BE SOLVED: To improve the efficiency of document preparation in datebase design using a terminology dictionary table and productivity at the time of constructing the terminology dictionary table. SOLUTION: The attributes and numbers of digits of terms having the same concept of respective ...
地理信息数据库中数据字典的设计肖计划, 刘海砚, 栾晓岩(信息工程大学 测绘学院, 河南 郑州 4 5 5 2)摘据库设计中, 可以将数据字典分为三种类型, 它们的应用增强了软件实现的灵活性和高效性, 对于地理信息及数字地图制图软件的开发具有重要意义。关键词: 地理信息; 数字地图制图; 数据字典; 软件开发; D B ...
In solving this problem, we add a Lookup Table like Id Status 1 Not Started 2 In Progress ... So that our DBA can have a dictionary to "lookup", showing the status text by joining with this lookup table. Share Improve this answer Follow answered Feb 1, 2018 at 21:05 Blaise 22k...
How can I generate a class from a SQL Server table object? I'm not talking about using some ORM. I just need to create the entities (simple class). Something like: public class Person { public string Name { get;set; } public string Phone { get;set; } } Given some table like: ...
Define database field. database field synonyms, database field pronunciation, database field translation, English dictionary definition of database field. n. A database system in which any field can be a component of more than one of the database's table
I.E.Physical Design The aim of physical database design is to decide how thelogical database designwill be implemented. For the relational database, this involves: • Defining a set of the table structures, data types for fields, and constraints on these tables such as primary key, foreign...
8.The Design and Achievement of Data Dictionary in Dat abase System数据库系统数据字典的设计与实现 9.Design of User-defined Data Table Based on Existent Database;基于基础数据库自定义数据表的设计 10.Data Structure Design of Well Test Results Data Base and Its Improvement试井成果数据库数据结构设计...
The first table, thecustomertable, shows, for example, that the customer identified by customer-id 192-83-7465 is named Johnson and lives at 12 Alma St. in Palo Alto. The second table,account, shows, for example, that account A-101 has a balance of $500, and A-201 has a balance ...
Relationship Database Design Content Conceptual model - ERD Logical model - schema, data dictionary, attributes mapping, ... Physical model E-R Diagram (Conceptual Model) Conceptual Model - ERD How should I write a relationship in the diamond?