Answer Posted / mahesh

union all allows duplicates
union doesnt allows duplicates

What is check constraint. Explain with example.

1043

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can we view the access paths created by dbrm ? how ? thx

6972

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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 bind in db2?

975

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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

1309

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What are the various isolation levels possible?

1047

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How do you concatenate the firstname and lastname from emp table to give a complete name?

1011

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What is scrollable cursor in db2?

996

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What is meant by dclgen?

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What do you mean by between and in? Is between inclusive of specified range values?

1038

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Following a db2 update statement, what is the quickest way to compute the total number of updated rows?

1003

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Explain about rct.

1024

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List down the data types in the db2 database.

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What is meant by explain?

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How do you simulate the explain of an embedded sql statement in spufi/qmf?

1024

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