Question

assuming below table;

column name | type
id          | int
date        | varchar

When I use

SELECT ROWNUMBER() OVER( ORDER BY TYPE_DATE ) as ROWID,
       TO_DATE( date, 'mm\dd\yyyy' ) as TYPE_DATE,
       * 
FROM TABLE

I always get below error:

SQL0104N an expected token "*" was found following .... <select_sublist>

here are three questions:

1. Why can’t * be used here?
2. Why can’t this new column be used in OVER()
3. How can I get the set of second 10 records, order by a formatted column

Answer 1

To answer your first question, it is because you have designated additional columns, and DB2 is unable expand this * to a column list. You can fix this by adding a table identifier FROM TABLE T, and using the exposed identifier to expand the column list SELECT ..., T.*

As you can see on this chart from the Information Center, you can only have EITHER * OR expressions and exposed-name.*

>--+-*-----------------------------------------------+---------><
| .-,-------------------------------------------. |   
| V                                             | |   
'---+-expression--+-------------------------+-+-+-'   
    |             | .-AS-.                  | |       
    |             '-+----+--new-column-name-' |       
    '-exposed-name.*--------------------------'       

For two and three, the column can’t access the value of a function in the same SELECT clause by referring to it by its alias. You can push it lower into a sub-select, and then use the OVER() function. You can then get the rows you want by adding a BETWEEN:

SELECT ROWNUMBER() OVER( ORDER BY TYPE_DATE ) as ROWID, T1.*
FROM (
    SELECT TO_DATE( date, 'mm\dd\yyyy' ) as TYPE_DATE, T.* 
    FROM TABLE T
) T1
WHERE ROWNUMBER() OVER( ORDER BY TYPE_DATE ) BETWEEN 10 AND 20
ORDER BY TYPE_DATE