Answer Posted / mohd rizwan patel
Loading records from PS, or from vsam files to directly into
table, by using LOAD utility of DB2.
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Explain the contents that are a part of dclgen.
Before you give the explain statement, what are the prerogatives?
What is db2 connect?
by using cursors , we can access particular records from the table based on some condition, i want to delete those selected records, how can we write a query for this in the program?
What is query_cache_limit?
Where can you declare a cursor in a cobol-db2 program?
What is node in db2?
What are iseries servers?
What is meant by union and union all?
What is meant by explain?
What is the role of schema in the db2 database?
What are the full forms of spufi and dclgen and why are they used?
Is db2 a mainframe database?
What does a deadlock mean in DB2?
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.
