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

What is system global area (sga) in oracle?

1035

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

1084

List the various oracle database objects?

1112

What is the implicit cursor in oracle?

1173

What is dual table oracle?

1030

What is the use of oracle?

1078

what is the dual table in oracle?

1041

How to rename an index in oracle?

1172

What is control file used for?

1303

Define the SGA and: How you would configure SGA for a mid-sized OLTP environment? What is involved in tuning the SGA?

2315

How to create additional tablespaces for an new database?

1079

Which is better Oracle or MS SQL? Why?

6486

Does oracle partitioning improve performance?

1053

How to use subqueries with the in operator using oracle?

1139

What is an oracle function?

1244