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.
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}
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. :)
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
Say you have a MySQL 5.0 MyISAM table with 100 million rows, with one index (other than primary key) on two integer columns.
With the following entity relationship structure I\'m struggling to figure out if the relationship between the LOAN and ITEM entities is valid?
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
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
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
From my understanding you don\'t gain much by setting an index in a column that will hold few distinct values.
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