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Question
What do you mean by NOT NULL? When will you use it?
 Question Submitted By :: Guest
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What do you mean by NOT NULL? When will you use it?
Answer
# 1
NOT NULL disallows nulls for the column. Primary Key must 
be defined as NOT NULL or any key that you do not want to 
have NULLS, becaue the default is that any column can 
contain NULLs
 
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  Re: What do you mean by NOT NULL? When will you use it?
Answer
# 2
CREATE UNIQUE WHERE NOT NULL INDEX index1
ON table(column); 

WHERE NOT NULL ensures that non-null values are unique.
 
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Other DB2 Interview Questions
 
  Question Asked @ Answers
 
How would one remove old reorg information from the DB2 catalog?  1
What is a view? Why use it?  2
What is meant by isolation level?  1
What is EXPLAIN?  1
What is a host variable?  1
Lot of updates have been done on a table due to which indexes have gone haywire. What do you do?  1
Explain the use of the WHERE clause?  1
What is a thread?  1
What is the purpose of the WHENEVER statement?  1
What is the cascade rule and how does it relate to deletions made with a subselect?  1
What is the difference between IN subselects and EXISTS subselect? HCL1
What is ACQUIRE/RELEASE in BIND?  2
Assuming that a site's standard is that pgm name = plan name, what is the easiest way to find out which Will precompile of an DB2-COBOL program bomb, if DB2 is down?  1
What statistic will tell the DBA how must space can be reclaimed from dropped table spaces on the next reorg run?  1
How do u achieve record level locking in DB2 versions when record level locking is not allowed?  2
How can you split a table in to exactly half? HSBC4
what is the process of precompiler?  2
How we create a tables in DB2 ?Previously client has using 7 letters for user id,now he wants to increase the letters from 7 to 12 for user id.How we can do it? Wipro4
what needs to be done if a table is in copy pending / check pending status? Xansa4
What are the disadvantages of PAGE level lock?  3
 
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