I understand Join always perform better than subqueries. Then what is the advantage/use of Subqueries/correlated subqueries etc.,in DB2 programming.Please explain.

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suppose in my table 10 rows are there , i want to update odd rows salary as 90000 ? how u do it ? any one help me ? what do we use here cursor-fetch or normal sql ?

5 Answers   IBM,

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What is node in db2?

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what is difference between random and sequence file access

1 Answers   Syntel,

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Can you use a select query in a loop to fetch multiple rows? If so what is the advantage of using a cursor?

2 Answers   L&T, UST,

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What are the different types of base tables?

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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.

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What is the physical storage length of the data types: date, time, timestamp in the db2 database?

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What is FREEPAGE and PCTFREE in TABLESPACE creation?

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What is a storage group (stogroup)?

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What is buffer pool in the db2 database?

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What does the sqlcode of -818 pertain to?

3 Answers  

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