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What is bind in db2?
What is db2 command?
How to check sequence on a table in db2?
What is the meaning concurrency in the db2 database?
What is difference between isnull and coalesce?
What types of tables are there in the db2 database?
How do you concatenate the firstname and lastname from emp table to give a complete name?
Mention data types used in db2 ?
Is db2 a mainframe?
Which component is responsible for db2 startup and shutdown?
What is the use of commit in db2?
What is lock escalation in db2?
What is a storage group (stogroup)?
What is with ur 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.
