How to determine the last record inserted

hi
I have a table abc ( x number, y number, z date ) columns, there
is no primary or unique key.
I have been inserting values into it. there r some duplicate
values to.
but now I want to modify only the record inserted at the end.
i.e
if initially ABC is having
x y z
10 20 01-nov-2001
11 20 01-nov-2001
out of these records I want to change the value of x to 50 for
the record which was inserted last or shall I say whose z is the
greatest.
I have been trying to do but what I see that the z column is not
getting the time in increasing order. i.e even though I tried to
display the dated in dd-mon-yyyy 24hh:mm:ss format still and I
found that date is not consistant. the record I inserted first
is have a much more value than the record I inserted last.
please help...
Sreekant

rowid refers to the current position of the record; if the
record has been moved (and there are any number of reasons why
the database might shift a record) the order of rowid will not
reflect the order of insertion.
the only way to guarantee order of insertion is to timestamp the
record. if I understand the original posting, you have been
doing this.
Now you should have been using SYSDATE. if you are saying that
SYSDATE is giving you inconsistent results then you have a real
problem: has somebody been tinkering with your database server -
changing the system clock or something?
Or are you using some other method to set the value for Z
column? If so, what?
rgds, APC

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I dont know what table names and fields you have but
say you have a table called XYZ which has a primary
key field called keyID.
So in order to get the last row inserted, you could
do something like
Select *
from XYZ
where keyID = (Select MAX(keyID) from XYZ);
Good Luckwhat gubloo said is correct ...But this is all in MS SQL Server I don't know the syntax and key words in MYSQL
This works fine if the emp_id is incremental and of type integer
Query:
select      *
from      employee e, (select max(emp_id) as emp_id from employee) z
where      e.emp_id = z.emp_id
or
select top 1 * from employee order by emp_id descUday

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:-) Hiee E'body
I work on Oracle 8i and need to get the last
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:-) Have a nice time
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India.

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:-) Hiee E'body
I work on Oracle 8i and need to get the last
record inserted in a table.
I have tried using rownum and rowid pseudo-columns
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Can you please help me out ?
:-) Have a nice time
Vivek Kapoor.
IT, Atul Ltd.,
India.

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