How will you delete duplicate records from a table?
Answers were Sorted based on User's Feedback
Answer / tharanath.n
delete from table a
where rowid >(select min(rowid) from table b
where a.column = b.column);
Is This Answer Correct ? | 13 Yes | 5 No |
Answer / ajay kumar ande
question is wrong......records-----files,table-----rows
How will you delete duplicate records(rows) from a table?
pgm=sort
sortin dd dsn=-----
sortout dd dsn=-----
sysin dd *
sort fields=(2,3,ch,a)
sum fields=none ------>eliminates duplicate recs
Is This Answer Correct ? | 3 Yes | 1 No |
Answer / venkat
delete from emp where ecode IN ( select ecode from emp group by ecode having count(*) >1 )
Is This Answer Correct ? | 5 Yes | 4 No |
Answer / mehdee
Hi. This is a database design problem, because if you
alowe duplicate rows then you must have at least a column
being like squence number.
Is This Answer Correct ? | 2 Yes | 2 No |
Answer / naresh.s
in DB2
first we need to know duplicate records in database file
like tmpfilep ,for that
select RRN(A) from tmpfilep A where field='fieldvalue'
here field means any fileld containd tmpfilep and
corresponding value.
once we execute the above query we will get relative record
numbers of each row and remember that numbers
now you can delete records based on these numbers
delete from tmpfilep A where rrn(A) in (234,341,642)
here 234,341,642 are sample record numbers
may be i am correct upto my knowledge.......
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / king
DELETE FROM FILE WHERE FIELD = ALL(SELECT FIELD FROM FILE
GROUP BY FIELD HAVING COUNT(*) > 1)
OR
DELETE FROM FILE WHERE FIELD = ANY(SELECT FIELD FROM FILE
GROUP BY FIELD HAVING COUNT(*) > 1)
Is This Answer Correct ? | 1 Yes | 7 No |
Answer / s
DELETE FROM TABLE ABC
WHERE COLUMN =
(SELECT COLUMN FROM TABLE ABC
GROUP BY COLUMN
HAVING COUNT(*) > 1);
Is This Answer Correct ? | 20 Yes | 36 No |
If the main program has only cobol statements and subprogram has the db2 statements what is the procedure for precompilation. for which program we need to do the precompilation
how many bytes timestamp token occupies?
6 Answers Boss Global, Cap Gemini, TCS,
What is a lock?
What is db2 and what is the use of db2 optimizer?
can we view the access paths created by dbrm ? how ? thx
What is the maximum length of sqlca?
My SQL is not performing well. Describe how will you fine tune it?
What are common abends
What is the difference between dbm cfg and db cfg file in db2 ?
How we create a tables in DB2 ?Previously client has using 7 letters for user id,now he wants to increase the letters from 7 to 12 for user id.How we can do it?
What is the significance of DB2 free space and what parameters control it?
Which is faster delete or truncate?