Is there any date type that can be used for 0-255
values? Like an "int1" or byte column.
CSN
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CSN wrote: Is there any date type that can be used for 0-255 values? Like an "int1" or byte column.
You can use a smallint with constraint.
HTH
Shridhar
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On Thu, 2003-10-09 at 02:16, CSN wrote: Is there any date type that can be used for 0-255 values? Like an "int1" or byte column.
An int2 with a constraint on it.
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> Is there any date type that can be used for 0-255 values? Like an "int1" or byte column.
A SMALLINT is two bytes on disk, use "char" instead. This is a hidden
goodie in PostgreSQL and one that I wish was exposed via a more
conventional syntax (*hint hint*). http://developer.postgresql.org/docs...-SPECIAL-TABLE
-sc
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Sean Chittenden
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On Thu, 2003-10-09 at 03:19, Sean Chittenden wrote: Is there any date type that can be used for 0-255 values? Like an "int1" or byte column.
A SMALLINT is two bytes on disk, use "char" instead. This is a hidden goodie in PostgreSQL and one that I wish was exposed via a more conventional syntax (*hint hint*).
http://developer.postgresql.org/docs...-SPECIAL-TABLE
Wouldn't that be, though, a signed byte? The OP wants unsigned.
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> http://developer.postgresql.org/docs...-SPECIAL-TABLE
Is it unsafe practice to use the datatype "name" for
attributes that hold table or column names etc ?
Karsten
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On Thu, 9 Oct 2003, Sean Chittenden wrote: Is there any date type that can be used for 0-255 values? Like an "int1" or byte column. A SMALLINT is two bytes on disk, use "char" instead. This is a hidden
However "char" has some serious deficiencies IIRC, such as the fact that
there's no int<->"char" casts and it's standard I/O format is characters.
You can use ascii and chr to get around some of that, but it's ugly.
goodie in PostgreSQL and one that I wish was exposed via a more conventional syntax (*hint hint*).
If we were going to do that I think we'd be better off making a new type
and leaving "char" alone.
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> > > Is there any date type that can be used for 0-255 values? Like an "int1" or byte column. A SMALLINT is two bytes on disk, use "char" instead. This is a hidden
However "char" has some serious deficiencies IIRC, such as the fact that there's no int<->"char" casts and it's standard I/O format is characters. You can use ascii and chr to get around some of that, but it's ugly.
*nods* I have explicit casts everywhere when dealing with "char" and
it's far from being elegant or clean. goodie in PostgreSQL and one that I wish was exposed via a more conventional syntax (*hint hint*).
If we were going to do that I think we'd be better off making a new type and leaving "char" alone.
You won't hear any disagreements from me on this one. I've
sufficiently abused "char" as a 1 byte storage field and would love to
see an int1 or tinyint datatype added to cover this situation. -sc
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On Thu, 2003-10-09 at 12:54, Sean Chittenden wrote: > Is there any date type that can be used for 0-255 values? Like > an "int1" or byte column.
A SMALLINT is two bytes on disk, use "char" instead. This is a hidden
However "char" has some serious deficiencies IIRC, such as the fact that there's no int<->"char" casts and it's standard I/O format is characters. You can use ascii and chr to get around some of that, but it's ugly.
*nods* I have explicit casts everywhere when dealing with "char" and it's far from being elegant or clean.
goodie in PostgreSQL and one that I wish was exposed via a more conventional syntax (*hint hint*).
If we were going to do that I think we'd be better off making a new type and leaving "char" alone.
You won't hear any disagreements from me on this one. I've sufficiently abused "char" as a 1 byte storage field and would love to see an int1 or tinyint datatype added to cover this situation. -sc http://www.postgresql.org/docs/7.3/s...atedomain.html
CREATE DOMAIN domainname [AS] data_type
[ DEFAULT default_expr ]
[ constraint [, ... ] ]
where constraint is:
[ CONSTRAINT constraint_name ]
{ NOT NULL | NULL }
test1=# create domain d_tinyint as smallint constraint chk_tinyint CHECK (smallint between 0 and 255);
ERROR: DefineDomain: CHECK Constraints not supported
So, how would I create a domain that limits a smallint?
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Bertrand Meyer
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On Thu, Oct 09, 2003 at 14:28:57 -0500,
Ron Johnson <ro***********@ cox.net> wrote: http://www.postgresql.org/docs/7.3/s...atedomain.html CREATE DOMAIN domainname [AS] data_type [ DEFAULT default_expr ] [ constraint [, ... ] ]
where constraint is:
[ CONSTRAINT constraint_name ] { NOT NULL | NULL }
test1=# create domain d_tinyint as smallint constraint chk_tinyint CHECK (smallint between 0 and 255); ERROR: DefineDomain: CHECK Constraints not supported
So, how would I create a domain that limits a smallint?
You need to use 7.4. In 7.3 you couldn't use check constraints with domains.
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