What is join dependency and inclusion dependency?
Submitted by: AdministratorJoin Dependency:
A Join dependency is generalization of Multivalued dependency.A JD {R1, R2, ..., Rn} is said to hold over a relation R if R1, R2, R3, ..., Rn is a lossless-join decomposition of R . There is no set of sound and complete inference rules for JD.
Inclusion Dependency:
An Inclusion Dependency is a statement of the form that some columns of a relation are contained in other columns. A foreign key constraint is an example of inclusion dependency.
Submitted by: Administrator
A Join dependency is generalization of Multivalued dependency.A JD {R1, R2, ..., Rn} is said to hold over a relation R if R1, R2, R3, ..., Rn is a lossless-join decomposition of R . There is no set of sound and complete inference rules for JD.
Inclusion Dependency:
An Inclusion Dependency is a statement of the form that some columns of a relation are contained in other columns. A foreign key constraint is an example of inclusion dependency.
Submitted by: Administrator
Read Online RDBMS Job Interview Questions And Answers
Top RDBMS Questions
| ☺ | What is VDL (View Definition Language)? |
| ☺ | Difference between controlled and uncontrolled redundancy? |
| ☺ | What is RDBMS KERNEL? |
| ☺ | What is SDL (Storage Definition Language)? |
| ☺ | What is 5NF? |
Top Databases Programming Categories
| ☺ | RDBMS Interview Questions. |
| ☺ | SQL Interview Questions. |
| ☺ | SSRS Interview Questions. |
| ☺ | Database Administrator (DBA) Interview Questions. |
| ☺ | Sybase Interview Questions. |
