simple limit of decimals

In response to pere roca :

hi all,

I update a column based on a division over two real values. It causes a huge
number of decimals that I wanna to limit.

UPDATE point_pol SET taxa_record = ((SELECT ((CASE WHEN numtax>0 THEN
numtax/numreg ELSE 1 END))) where userid='hello'

taxa_record values are real and with real I cannot limit the decimals.
I tried to apply a round in the sql sentence but complains that round must
be applied to a single value each time.

Tray:

UPDATE point_pol SET taxa_record = round(((SELECT ((CASE WHEN numtax>0
THEN numtax/numreg ELSE 1 END))),2) ...

to round to 2 decimal places.

Andreas
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On Wed, Jan 14, 2009 at 5:43 AM, pere roca <peroc79@gmail.com> wrote:

hi all,

I update a column based on a division over two real values. It causes a huge
number of decimals that I wanna to limit.

UPDATE point_pol SET taxa_record = ((SELECT ((CASE WHEN numtax>0 THEN
numtax/numreg ELSE 1 END))) where userid='hello'

taxa_record values are real and with real I cannot limit the decimals.
I tried to apply a round in the sql sentence but complains that round must
be applied to a single value each time.

Are you doing accounting with reals? not a good idea due to rounding
issues, far better to use numeric(x,y) which will, incidentally, limit
your number of decimal places for you.

dear Andreas,

thanks for the answer; yes, round should be the first, but it gives an
error: Function round(real, integer) does not exists

following this mail
(http://archives.postgresql.org/pgsql-bugs/2003-01/msg00074.php) I created a
new function and now works!

best regards,
Pere

Andreas Kretschmer-4 wrote:

In response to pere roca :

hi all,

I update a column based on a division over two real values. It causes a
huge
number of decimals that I wanna to limit.

UPDATE point_pol SET taxa_record = ((SELECT ((CASE WHEN numtax>0 THEN
numtax/numreg ELSE 1 END))) where userid='hello'

taxa_record values are real and with real I cannot limit the decimals.
I tried to apply a round in the sql sentence but complains that round
must
be applied to a single value each time.

Tray:

UPDATE point_pol SET taxa_record = round(((SELECT ((CASE WHEN numtax>0
THEN numtax/numreg ELSE 1 END))),2) ...

to round to 2 decimal places.

Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net

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In response to pere roca :

dear Andreas,

thanks for the answer; yes, round should be the first, but it gives an
error: Function round(real, integer) does not exists

UPDATE point_pol SET taxa_record = round(((SELECT ((CASE WHEN numtax>0
THEN numtax/numreg ELSE 1 END)))::numeric,2) ...

sorry, my fault, i forgot the CAST.

Andreas
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Andreas Kretschmer
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2009/1/14 A. Kretschmer <andreas.kretschmer@schollglas.com>:

In response to pere roca :

dear Andreas,

thanks for the answer; yes, round should be the first, but it gives an
error: Function round(real, integer) does not exists

UPDATE point_pol SET taxa_record = round(((SELECT ((CASE WHEN numtax>0
THEN numtax/numreg ELSE 1 END)))::numeric,2) ...

An example of triki round:

postgres=# select round((9.88888::real)::numeric,2);
round
-------
9.89
(1 row)

postgres=#

sorry, my fault, i forgot the CAST.

Andreas
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