what is primary key,unique key, foreign key? can u teach me
in simple language?
Answer Posted / rahul patil
PRIMARY key is one which uniquely identifies a row in the
table.
It does not has any null value entry.It can be formed by
using one or more fields of the table.If more fields are
used then the key is known as COMPOSITE key
| Is This Answer Correct ? | 6 Yes | 5 No |
Post New Answer View All Answers
What is global database name?
What will happen non-clustered index will be created on clustered index?
Differentiate between extension & intension?
There are three servers are run by Oracle, MS Access and .Net. What are the procedure fetching the values of two variables from two servers among these?
if i want to display the name of students such that to which city they belong must have count greaer than two
Explain artificial key?
What is the DIF format and when we will use in teradata
How many indexes can be created on a table?
What are the disadvantages of views in a database?
What is the difference between a stored procedure and a query?
How heap is implemented in database?
Explain the various types of normalization.
What is the candidate key used for?
How does database replication work?
Hi, I want do a course in DWH Informatica Administrator and Abinito Administrator please tell me some institute in chennai and i am searching for a job,so please help me and my mail id : satty_rh@yahoo.co.in Thanks, Kumar