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Answer Posted / bhanu prasad
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What is a page in db2?
What is the cobol picture clause of the db2 data types date, time, timestamp?
what is diffrence b/w file-aid tool and file-aid utility???
Explain the benefits you can get from mainframe connect?
What is load replace in db2?
Which component is responsible for processing sql statements and selecting access paths?
before altering a table is it necessary to lock ? if lock what is it ? how to do ? ifi want to lock a table what is that command ?
what are bind concepts in db2 cobol?
What is rebind in db2?
What is the usage of open cursor command?
Is db2 a programming language?
When a COBOL-DB2 program in PRODUCTION is updating main tables and gone for long run, what have to do?
Which isolation level provides maximum concurrency?
How can the duplicate values be eliminated from db2 select?
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.
