why can't we assign not null constraint as table level
constraint




Answers were Sorted based on User's Feedback



why can't we assign not null constraint as table level constraint..

Answer / lokanath

Because its a Column Level constraint.
Not Null is a Constraint which will ensure the Column
should not be null.

Is This Answer Correct ?    10 Yes 12 No

why can't we assign not null constraint as table level constraint..

Answer / senthil

not null constraint applied on table level constraint but table must be empty otherwise not possible .

Is This Answer Correct ?    0 Yes 3 No

why can't we assign not null constraint as table level constraint..

Answer / newton_dba

A NOT NULL CONSTRAINT IS USAUALLY APPLIED ON COLUMN LEVEL
BUT IT CAN BE APPLIED ON THE TABLE LEVEL BY USING ALTER
TABLE STATMENT

ALTER TABLE EMP
MODIFY (ENAME CONSTRAINT EMP_ENAME_NN NOT NULL);

Is This Answer Correct ?    7 Yes 13 No



Post New Answer



More Oracle General Interview Questions

Difference between the “verify” and “feedback” command?

0 Answers  


Explain 1st, 2nd, 3rd normalization form of data base

3 Answers   Thermotech, KH,


How to loop through a cursor variable?

0 Answers  


How to import one table back from a dump file?

0 Answers  


How to connect asp pages to oracle servers?

0 Answers  






what is the difference between rollback & commit? can a foreign key has null value?

6 Answers  


How to put more than 1000 values into an oracle in clause?

0 Answers  


when i run my query on yesterday it is fast but today it is slow why?

1 Answers  


Please explain joins in oracle?

0 Answers  


What is the meaning of recursive hints in oracle?

0 Answers  


What is the effect of setting the value "all_rows" for optimizer_goal parameter of the alter session command? What are the factors that affect optimizer in choosing an optimization approach?

0 Answers  


How to enter a new row into a table interactively?

0 Answers  






Categories
  • Oracle General Interview Questions Oracle General (1789)
  • Oracle DBA (Database Administration) Interview Questions Oracle DBA (Database Administration) (261)
  • Oracle Call Interface (OCI) Interview Questions Oracle Call Interface (OCI) (10)
  • Oracle Architecture Interview Questions Oracle Architecture (90)
  • Oracle Security Interview Questions Oracle Security (38)
  • Oracle Forms Reports Interview Questions Oracle Forms Reports (509)
  • Oracle Data Integrator (ODI) Interview Questions Oracle Data Integrator (ODI) (120)
  • Oracle ETL Interview Questions Oracle ETL (15)
  • Oracle RAC Interview Questions Oracle RAC (93)
  • Oracle D2K Interview Questions Oracle D2K (72)
  • Oracle AllOther Interview Questions Oracle AllOther (241)