Update statement query

Question

I have a peculiar problem related to update statement.
In a table "table1" I have the following values for the column Name.
John
Doe
Adam
Teela
I need to do the following updates
John -> Adam
Doe -> Teela
Adam -> Doe
Teela -> John
One way of doing it would be to use the ROWID.
Update table1 set value=Adam where ROWID=1
Update table1 set value=Teela where ROWID=2
and so on and so forth.
But I don't want to use the ROWID.
Therefore the logical query that one would write is
Update table1 set value=Adam where value=John
Update table1 set value=Teela where value=Doe
Update table1 set value=Doe where value=Adam
Update table1 set value=John where value=Teela
But immediately the problem becomes apparent.
The converted table would now look like this
Doe
John
Doe
John
How do I make sure that the updation happens as I intend? Is there a way to work around it without ROWID?
Message was edited by:
user574608

Answer 1

Much too late, but I don't want to have made it in vain ;) :
michaels>  CREATE TABLE table1 (ID INTEGER,VALUE VARCHAR2(10))
Table created.
michaels>  INSERT INTO table1
     VALUES (1, 'John')
1 row created.
michaels>  INSERT INTO table1
     VALUES (2, 'Doe')
1 row created.
michaels>  INSERT INTO table1
     VALUES (3, 'Adam')
1 row created.
michaels>  INSERT INTO table1
     VALUES (4, 'Teela')
1 row created.
michaels>  UPDATE table1
   SET VALUE =
          CASE VALUE
             WHEN 'John'
                THEN 'Adam'
             WHEN 'Doe'
                THEN 'Teela'
             WHEN 'Adam'
                THEN 'Doe'
             WHEN 'Teela'
                THEN 'John'
          END
4 rows updated.
michaels>  SELECT *
  FROM table1
        ID VALUE    
         1 Adam     
         2 Teela    
         3 Doe      
         4 John     
4 rows selected.