primary key has unique value, it dostnt contain null values and duplicate

what is primary key and foreign key when and where have to use

Question Posted / chandrika

Answer Posted / chandrika

primary key has unique value, it dostnt contain null values
and duplicate values.

foregin key is primary key of another table

Is This Answer Correct ?

2 Yes

2 No

Please Help Members By Posting Answers For Below Questions

How to define a data source name (dsn) in odbc manager?

964

How many types of segments in Oracle?

1011

why dont we assign not null constraint as table level constraint.

2682

Explain the blob datatype?

1011

Can u please explain me the Discussion on Except ,using cast like type cast. Question in the context of difference between two tables

1995

Why does for update in oracle 8 cause an ora-01002 error?

931

What do you know about normalization? Explain in detail?

879

Can a formula column be obtained through a select statement ?

2262

Explain what are the type of synonyms?

1053

what is reindexing?

1608

Can select statements be used on views in oracle?

978

Â What are the oracle DML commands possible through an update strategy?

1003

What are the differences between char and nchar in oracle?

1020

Explain do view contain data?

938

What is the best way to do multi-row insert in oracle?

1012