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On MultiColumn Foreign Key Discovery Maui ZhangMarios HadjieleftheriouBeng Chin Binational University of Singapore AT&T Labs ResearchNational University of Singaporemarioh research.att.com Zhang comp.nus.edu.SG
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How to fill out on multi-column foreign key
How to fill out on multi-column foreign key
01
To fill out on a multi-column foreign key, follow these steps:
02
Identify the tables involved in the multi-column foreign key relationship.
03
Determine the columns that form the composite key in the primary table.
04
Make sure that the corresponding columns in the referenced table have the same data types and lengths as the primary key columns.
05
Insert records into the primary table, ensuring that the values in the composite key columns match the values in the referenced table's columns.
06
If necessary, update or delete records in the primary table without violating referential integrity by retaining the values in the composite key columns.
07
Test the foreign key constraint by performing queries and joins between the primary and referenced tables.
Who needs on multi-column foreign key?
01
Multi-column foreign keys are useful for databases that require complex relationships between tables.
02
They are commonly used in cases where a single column cannot uniquely identify a record, and multiple columns are necessary to form a unique identifier.
03
Examples of scenarios where multi-column foreign keys are needed include hierarchical data structures, composite entities, and various types of joins.
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What is on multi-column foreign key?
A multi-column foreign key is a combination of multiple columns in a table that reference the primary key in another table.
Who is required to file on multi-column foreign key?
Database administrators or developers may be required to set up and maintain multi-column foreign keys.
How to fill out on multi-column foreign key?
To fill out a multi-column foreign key, you need to specify the columns that make up the key and the primary key they reference in another table.
What is the purpose of on multi-column foreign key?
The purpose of a multi-column foreign key is to enforce referential integrity between related tables in a database.
What information must be reported on on multi-column foreign key?
Information regarding the columns that make up the key and the table and columns they reference must be reported on a multi-column foreign key.
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