moving data in datafile to another along with the oracle user

[karthik75]

dear friends

please help me in this situation.

the situation is like this

1. dba_users

username | default tablespace

a | a_data
b | b_data

2. tablspace and datafile:

tablespace_name| datafile

a_tablespace | d:\data\a_data.dbf
b_tablespace | d:\data\b_data.dbf

My requirement :

1. I want to alter user a and set default tablespace as b_data.
( This can be done just by alter user .... deafult tablespace...)
2. i have to drop the tablespace a_data along with physically removing the file, before doing this i want to move all the tables and data relating to user a(tablespace a_data) to tablespace b_data.

i dont want to use export and import. Can this be done without taking logical backup and importing the same. Please help me out in this matter and i will be very greatful to you all. I am using Oracle 8.0.5 on NT.

[pipo]

you can do :
alter table [table] move tablespace [new tablespace]