How many sub queries can you combine together ?

4 Answers   IBM,

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What are the different methods of accessing db2 from tso? How is the connection established between TSO & DB2?

3 Answers   Tech Mahindra,

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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.

0 Answers  

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When do you specify the isolation level?

0 Answers  

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What is meant by isolation level?

3 Answers  

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Can there be more than one cursor open for any program?

0 Answers  

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How do I optimize a query in db2?

0 Answers  

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How does one remove entries from the SCT02 table?

1 Answers  

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What is subquery ?

6 Answers  

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Mention the downsides of page level lock.

0 Answers  

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What are the disadvantages of PAGE level lock?

3 Answers  

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What are the various locking levels available?

3 Answers  

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