cardinality

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Database design: How to restrict a n:m relation by other relations?

I think it\'s best to ask based on an example: There are people, customers and projects. People to customers is a n:m relationship. People can work for multiple customers.[详细]

2023-01-30 10:52 分类：问答
Intensional and extensional definition of sets

I am searc开发者_运维百科hing for a extensional definition for the following set: E := { m | m subset {a,b,c,d} and |m| = 2}[详细]

2023-01-21 06:51 分类：问答
How to get the minCardinality of properties?

I am using Jena. How 开发者_C百科can I get the minCardinality of a property?Try asking on SemanticOverflow.comLet me guess... it\'s a class assignment? Maybe ask Fateme. :)[详细]

2023-01-19 03:12 分类：问答
Cardinality in PostgreSQL

I have a UML diagram of what I need my database schema to look like. This diagram includes roles and cardinality. How can I enforce car开发者_JAVA百科dinality in Postgres?Cardinality is enforced by us[详细]

2023-01-04 20:24 分类：问答
MySQL index cardinality - performance vs storage efficiency

Say you have a MySQL 5.0 MyISAM table with 100 million rows, with one index (other than primary key) on two integer columns.[详细]

2022-12-25 20:10 分类：问答
Entity Relationships - Can a weak entity take part in a 'one to many' relationship as the 'one'

With the following entity relationship structure I\'m struggling to figure out if the relationship between the LOAN and ITEM entities is valid?[详细]

2022-12-23 00:54 分类：问答
Question about mysql indexes on low to medium cardinality columns

I have a general question about the way that database indexing works, particularly in mysql.开发者_StackOverflow中文版Let\'s say I have a table with a million rows with a column \"ClientID\" that is d[详细]

2022-12-22 21:08 分类：问答
How to check modality/cardinality on a relationship in Oracle

开发者_开发技巧I am attempting to reverse engineer a Database that is in Oracle. I have been able to find the main keys and the referential integrity rules that correspond to the Foreign Keys but cann[详细]

2022-12-20 06:28 分类：问答
Apache POI Excel Row & Column Indexing

I\'m using Apache POI to create a large Excel spreadsheet that is extremely formula heavy for a client that may later modify the code of my program with new formulas. The big issue that I\'m running i[详细]

2022-12-20 03:36 分类：问答
Does it make sense to use an index that will have a low cardinality?

From my understanding you don\'t gain much by setting an index in a column that will hold few distinct values.[详细]

2022-12-16 23:39 分类：问答