What is a constraint. Types of constraints ?
- 5 Answers
- 23880 Views
- Accenture, BirlaSoft, I also Faced
- E-Mail Answers
Answer Posted / samuvel
Constraint is a restriction on table
Types:
1)Column Constraints:applicable for column level
i)unique ii) not null
2)Table constraints:applicable for table level
1)primary key ii) foreign key d. check
| Is This Answer Correct ? | 8 Yes | 4 No |
Post New Answer View All Answers
What does select count (*) mean in sql?
Name some usages of database trigger?
What does 0 mean in sql?
What is the need of merge statement?
What is the default isolation level in sql server? : Transact sql
What are inner and outer joins examples of both?
Why do we use joins in sql?
Can a trigger call a stored procedure?
What is the purpose of normalization?
how can I make a script that can be bi-language (supports english, german)? : Sql dba
What is clustered index sql?
What is the difference between subquery and correlated query?
In pl/sql, what is bulk binding, and when/how would it help performance?
What are the parameter modes supported by pl/sql?
How does sql developer connect to oracle database?
