Dynamic select field

Question

Hello,
I have to perform a dynamic select statement with im_field variable.
select single max(im_field)....
I know that I have to use brackets in order to use variables inside the select statements, but what about in this case? I have a short dump with wrong fieldname.
I also tried select single max((im_field))...., but same result.

Answer 1

check this example to get an idea...
MAX( [DISTINCT] fdescriptor )
Addition:
... AS alias
Effect
Returns the largest value for the selected lines in the column identified by the Field descriptor fdescriptor.The DISTINCT specification does not alter the result. NULL values are ignored in the calculation, except when all of the values in a column are NULL. In this case, the result is NULL.
Example
Output a list of all customers on Lufthansa flight 0400 in 1995, along with the highest price paid, sorted by customer name:
TABLES: SCUSTOM, SBOOK.
SELECT SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
         MAX( SBOOK~LOCCURAM )
       INTO (SCUSTOM-NAME, SCUSTOM-POSTCODE, SCUSTOM-CITY,
             SBOOK-LOCCURAM)
       FROM SCUSTOM INNER JOIN SBOOK
         ON SCUSTOMID = SBOOKCUSTOMID
       WHERE SBOOK~FLDATE BETWEEN '19950101' AND '19951231' AND
             SBOOK~CARRID   = 'LH '                         AND
             SBOOK~CONNID   = '0400'
       GROUP BY SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
       ORDER BY SCUSTOM~NAME.
  WRITE: / SCUSTOM-NAME, SCUSTOM-POSTCODE, SCUSTOM-CITY,
           SBOOK-LOCCURAM.
ENDSELECT.
Addition
... AS alias
Effect
As in variant 1. You can also use an alternative column name in variants 2 - 6 to sort the result by an aggregate expression. Unlike aggregate expressions, you can use alternative column names in the ORDER-BY clause.
Example
Output a list of all customers on Lufthansa flight 0400 in 1995, along with the highest price paid, sorted by price and customer name:
TABLES: SCUSTOM, SBOOK.
SELECT SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
         MAX( SBOOK~LOCCURAM ) AS MAX
       INTO (SCUSTOM-NAME, SCUSTOM-POSTCODE, SCUSTOM-CITY,
             SBOOK-LOCCURAM)
       FROM SCUSTOM INNER JOIN SBOOK
         ON SCUSTOMID = SBOOKCUSTOMID
       WHERE SBOOK~FLDATE BETWEEN '19950101' AND '19951231' AND
             SBOOK~CARRID   = 'LH '                         AND
             SBOOK~CONNID   = '0400'
      GROUP BY SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
      ORDER BY MAX DESCENDING SCUSTOM~NAME.
  WRITE: / SCUSTOM-NAME, SCUSTOM-POSTCODE, SCUSTOM-CITY,
           SBOOK-LOCCURAM.
ENDSELECT.
Ramesh.