Question

I’m actually running oracle, but when I copied my example into sqlfiddle, it wouldnt run if I chose oracle instead of mysql, perhaps the fiddle version of oracle is different from mine.
http://www.sqlfiddle.com/#!2/44933/1

CREATE TABLE Positiontest(
ID VARCHAR(20),
code CHAR(06),
registrationdate DATE,
PRIMARY KEY(ID,code)
);

INSERT INTO Positiontest VALUES('01','COM002','2012-12-11');
INSERT INTO Positiontest VALUES('02','COM002','2012-12-12');
INSERT INTO Positiontest VALUES('01','COM003','2012-12-11');

This gives me positiontest table:

  ID     CODE      REGISTRATIONDATE
  01     COM002    2012-12-11
  02     COM002    2012-12-12
  01     COM003    2012-12-11

I want to create a view that looks like:

  ID     CODE      POSITION
  01     COM002    1
  02     COM002    2
  01     COM003    1

The order is not important, aslong as there
is one uniqe position for each code.

Answer 1

You want the row_number() function:

select pt.*,
       row_number() over (partition by code order by code) as Position
from PositionTest pt