Re: bad, bad field misuse. need to turn into to SQL.

On 08-Jan-2015 09:04 -0600, Glenn Gundermann wrote:

How's this?:

select
cast(substr((IXXXX * 10000),1,5) as decimal(5,0)) *.001 as width
,cast(substr((IXXXX * 10000),6,6) as decimal(6,0)) *.001 as length
from ...

Not so good. As I had noted in my prior reply [although for this
specific example, arguably incorrectly implying a more problematic
effect than actual, except if width=zero is allowed], the expression
"SUBSTR((IXXXX*10000),1,5)" is flawed because the result of the implicit
cast to character of (IXXXX*10000) results in a string value that is a
_left-justified_ numeric representation, so the first five characters
are not in fixed positions, but the substring operation is coded such
that the result must be static in size. The following example exhibits
the flaw:

create table qtemp/t7
( IXXXX DECIMAL(11, 4)
)
;
insert into qtemp/t7 values(5533366.6333),(0533306.6333)
; /* w1=55.333, l1=666.333; w2=05.333, l2=066.333 */
select ... /* as quoted above, with FROM QTEMP/T7 */
; -- the report follows:
....+....1....+....2....+
WIDTH LENGTH
55.333 666.333
53.330 66.333
; -- notice how the 2nd WIDTH<>05.333 though 05.333 was stored