Answer Posted / sunil1405
reclaims free spcace, orders the records
| Is This Answer Correct ? | 1 Yes | 29 No |
Post New Answer View All Answers
What is difference between rollback and commit?
What is meant by explain?
Give a brief description of db2 isolation levels?
SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
How can the duplicate values be eliminated from db2 select?
What is a cursor in programming?
Explain what are the various isolation levels possible?
What are the various data types available in db2?
In an sql table that is embedded, what is the procedure to retrieve rows that are part of a db2 table?
What is a db2 schema?
What is the default page size of buffer pools?
What is package in db2 mainframe?
How to check sequence on a table in db2?
Explain in brief how does db2 determine what lock-size to use?
What is universal database?
