Interested to Buy Any Domain ? << Click Here >> for more details...
what are primary key and foreign key ?
- 4 Answers
- 7623 Views
- Tesco, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / neo devan
Primary key is the attribute which satisfies both
uniqueness and Not null constraints.
The foreign key is a attribute that points to a valid
column in a parent table.
its used for referencing primary key.
| Is This Answer Correct ? | 8 Yes | 1 No |
Answer / rukumanikhandhan
primary key is the key which follows uniqueness in the
entire table.
primary key of one table will be called as foreign key in
another table.
| Is This Answer Correct ? | 7 Yes | 2 No |
Answer / sabeena parveen
primary key is an attribute which uniquely identifies each
record in the table.
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / radha
Columns acting as a primary key will always hold unique
values.
Foreign key should always be a primary key of some table
| Is This Answer Correct ? | 1 Yes | 0 No |
What is a candidate key in a database?
Define fragmentation.
Define union all operator and union.
What are the basic components of notification services?
What are functions in database?
What are the two types of data independence?
Explain the functionality of dml compiler.
What is considered a database?
What is the use of database management system?
What are the components of rdbms?
user says the db performance is slow or yesterday the query runned 1min and today its taking 30 min. how to trouble shot or were to start with?
What are five types of database models?
-
Oracle (3253) - SQL Server (4518)
- MS Access (429)
- MySQL (1402)
- Postgre (483)
- Sybase (267)
- DB Architecture (141)
- DB Administration (291)
- DB Development (113)
- SQL PLSQL (3330)
- MongoDB (502)
- IBM Informix (50)
- Neo4j (82)
- InfluxDB (0)
- Apache CouchDB (44)
- Firebird (5)
- Database Management (1411)
- Databases AllOther (288)
