Interested to Buy Any Domain ? << Click Here >> for more details...
what is primary key,unique key, foreign key? can u teach me
in simple language?
- 44 Answers
- 185868 Views
- Banking, CMC, CTS, HCL, Infosys, Keggfarms, SkyEss, Sunrise, TCS, Web Synergies, Wipro, I also Faced
- E-Mail Answers
Answer Posted / ck
Primary key is a key which will not allow any null values.
whereas unique key which will allows null value only once.
Foreign key is a key which values should match some values
in the primary key value.
| Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
What is Data Modelling?
What will happen non-clustered index will be created on clustered index?
Source File: Target EMPNO, SAL Empno, Format 101, 1000 101, 1000 101, 1100 101, 1000, 1100 101, 1000 101, 1000, 1100, 1000 101, 10000 101, 1000, 1100, 1000, 10000 102, 1100 102, 1100 102, 1300 102, 1100, 1300 102, 1200 102, 1100, 1300, 1200 102, 1500 102, 1100, 1300, 1200, 1500 How can i get that output using datastage(ETL) tool
What is the difference between oracle and MS Access?
issues involved in modeling and building data werahouses
define primary key index, bitmap index, hash index,virtual indwx
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
Is it good to store images in database?
What is odm database?
Is database a hardware or software?
What is a Transformation?
Explain database partitioning. What is its importance?
What is redis good for?
Which Statement would you use to remove the EMPLOYEE_Id_PK PRIMARY KEY constraint and all depending constraints from the EMPLOYEE table?
Is hive a database?
