Explain the key constraints and constraints on Null Values with examples?

Explain the key constraints and constraints on Null Values
with examples?

Question Posted / zeadbinyahya

2 Answers
4466 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Explain the key constraints and constraints on Null Values with examples?..

Answer / amit

hi ,

key constraits i.e. referential integerity means

all values in foreign key must be in primary key , but it
may happnes that NULL values may be in foreign key , but
not in primary key .

this is done to cater some of the exception conditions.

Is This Answer Correct ?

4 Yes

1 No

Explain the key constraints and constraints on Null Values with examples?..

Answer / navin kumar

because the key constraints can contains NULL value
but constrains not.

navin south delhi

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Database Management Interview Questions

What is progress open edge?

0 Answers

What file is read by ODBC to load drivers ?

1 Answers Oracle,

Explain the Importance of Data Normalization.

1 Answers

How to prevent concurrent access to my data?

0 Answers HCL,

Explain the Difference Between a Primary Key and a Foreign Key.

1 Answers

what is the difference between unique and primary key

5 Answers

What is drivermanager getconnection?

0 Answers

Enlist the cursor types.

0 Answers

Is this statement true or false? All databases must be in third normal form?

0 Answers

What is the use of CONSTRAINTS option in EXP command ?

1 Answers

what is normalization? types of normalization? example of each form? how do u implement normalization in ur project?

0 Answers

what is the difference between two and three-tier architectures?

0 Answers

For more Database Management Interview Questions Click Here