Answer / romeu viegas

Select ...
FROM ...
WHERE ...
FETCH FIRST 1 ROW ONLY

Answer / parthasarathi

select * from
(select * from emp a where rowid<(select max(rowid) from
emp b where a.empno=b.empno) x
where rownum=1

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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What does db2 plan contain?

0 Answers  

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How do you leave the cursor open after issuing a COMMIT? (for DB2 2.3 or above only)

2 Answers  

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What is a db2 tablespace?

0 Answers  

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Explain the use of the WHERE clause.

2 Answers   IBM,

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quary for 1> fetch last record 2> fetch in reverse order 3> fetch last 5 row 4> fetch second last record (their is no primary key) i think concept of count can be use for this in 4th

5 Answers  

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What is temporal table in db2?

0 Answers  

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In a Cobol-DB2 program, I am fetching rows from 4 tables using cursor and then based on the a field present in that table, It processes the information accordingly..for example stat-c is one digit field..if stat-c is 'D' then the a row is deleted from table and written those details in to a file. If the stat-c is 'U' then a row is updated (hardcoded what to update)in a table and written those details in to a file. If the stat-c is 'I' then a row is inserted in a table and written those details in to two files. The issue is i have to include the intermediate commits. When an abend occurs, due to commit statement db2 tables will be saved, But there will be lose of file contents. When we resubmitting the job associated with this program there will be insert ,update and delete anomolies to avoid that what measures could be taken?. The intermediate commit is nothing but issuing commit after massive inserts, updates and deletes(sum of 500actions)

2 Answers  

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by using cursors , we can access particular records from the table based on some condition, i want to delete those selected records, how can we write a query for this in the program?

4 Answers   Mphasis,

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Can we able to find all the Table names under a Particular Plan?

1 Answers   CTS,

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What do you mean by NOT NULL WITH DEFAULT? When will you use it?

3 Answers  

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Is db2 a programming language?

0 Answers  

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