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Update Top 30%

I want to update top 30% of a table. Is there a way without creating
a separate table?

create table temp_tableA (jobno varchar (20), formno varchar (20),
otherinfo varchar(20))
truncate table temp_tableA
insert into temp_tableA values ('1', '1', 'aaa')
insert into temp_tableA values ('1', '1', 'bbb')
insert into temp_tableA values ('1', '1', 'ccc')
insert into temp_tableA values ('1', '1', 'ddd')
insert into temp_tableA values ('1', '2', 'eee')
insert into temp_tableA values ('1', '2', 'fff')
insert into temp_tableA values ('1', '2', 'ggg')
insert into temp_tableA values ('1', '3', 'hhh')
insert into temp_tableA values ('1', '3', 'iii')
insert into temp_tableA values ('1', '3', 'jjj')
insert into temp_tableA values ('1', '4', 'kkk')

Now I want to update only top 30% of temp_tableA to formno 5.

When I ran this query:
UPDATE temp_tablea
SET formno = 5
WHERE exists (SELECT TOP 30 PERCENT *
FROM temp_tablea
)

It updated all the rows; is there a way to update without creating a
separate table?
Jul 20 '05 #1
1 12511

"Geetha" <ge******@hotmail.com> wrote in message
news:4b**************************@posting.google.c om...
I want to update top 30% of a table. Is there a way without creating
a separate table?

create table temp_tableA (jobno varchar (20), formno varchar (20),
otherinfo varchar(20))
truncate table temp_tableA
insert into temp_tableA values ('1', '1', 'aaa')
insert into temp_tableA values ('1', '1', 'bbb')
insert into temp_tableA values ('1', '1', 'ccc')
insert into temp_tableA values ('1', '1', 'ddd')
insert into temp_tableA values ('1', '2', 'eee')
insert into temp_tableA values ('1', '2', 'fff')
insert into temp_tableA values ('1', '2', 'ggg')
insert into temp_tableA values ('1', '3', 'hhh')
insert into temp_tableA values ('1', '3', 'iii')
insert into temp_tableA values ('1', '3', 'jjj')
insert into temp_tableA values ('1', '4', 'kkk')

Now I want to update only top 30% of temp_tableA to formno 5.

When I ran this query:
UPDATE temp_tablea
SET formno = 5
WHERE exists (SELECT TOP 30 PERCENT *
FROM temp_tablea
)

It updated all the rows; is there a way to update without creating a
separate table?


How do you identify the 'top' 30%? You might be looking for something like
this, assuming that the 'otherinfo' column is used to order the data:

UPDATE temp_tablea
SET formno = 5
WHERE otherinfo IN
(SELECT TOP 30 PERCENT otherinfo
FROM temp_tablea
ORDER BY otherinfo)

If you don't have ORDER BY, then you will effectively get a random 30% of
the rows.

Simon
Jul 20 '05 #2

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