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datatype conversion on postgresql 7.4.1

From: Timo Roessner <timo(dot)roessner(at)gmx(dot)net>
To: pgsql-novice(at)postgresql(dot)org
Subject: datatype conversion on postgresql 7.4.1
Date: 2005-05-20 20:34:21
Message-ID: 428E49CD.3080204@gmx.net (view raw or flat)
Thread:
Lists: pgsql-novice
hi everybody,

i got the following problem:

i have a database running on a postgresqlserver version 7.4.1, in the 
database is a table with 4 columns containing
float-numbers. what i want to do now is,  to convert the type of those 
columns from float to numeric, because
i want to limit the positions after the decimal point to 2.

what works fine in v. 8:

either

alter table fragment alter column  x type numeric(15,2)

or

update fragment set x = round(x,2)

but both wont work with version 7.4.1!

when i look into the documentation it seems to say that in 7.4.1 round() 
can only round to a given number of positions after the decimal point
when used with a numeric type, but not with floats!.

and if i try something like:

alter table fragment alter column  x type numeric(15,2)

i get an syntax error, so this seems to be no feature in 7.4.1 (didnt 
find anything like that in the docs too....)

what can i do to solve this? there must be some way in postgresql 7.4.1, 
if there is no way to do that, i have to
build up the whole database from scratch........there must be a way to 
convert float to numeric values in 7.4.1 ,
but i dont have a single clue...

thx for any help in advance



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