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.

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can any one expalin check point with an example?

1 Answers  

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What is a clustering index?

2 Answers  

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Compare a subselect to a join?

1 Answers  

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WHAT IS MEANT BY COMMIT COMMAND?

7 Answers   Wipro,

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i hav created a program and moved to production but failed to create the table which is been used in the program. the program shows error as soon as it is moved or installed in production or shows error during its runtime. what is the sqlcode for this error

3 Answers   UST,

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1 Answers   Danske,

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Hi, i would like to start a new carrier in DB2 DBA.Which and what all step should i have to take..?

0 Answers  

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Cursors can be declared in both working-storage & procedure division, Agreed. But is there any difference? If could you please suggest what is the difference. TIA

8 Answers   CGI, Wipro,

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What is the size of a data page?

2 Answers   IBM,

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When is the authorization check on DB2 objects done - at BIND time or run time?

1 Answers  

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why should we bind the DB2 program . What if we did not BIND a BD2 program ??

9 Answers   Infosys, TCS, Xansa,

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