Re: [SQL] create table and data types

[Ken Hill]

On Tue, 2006-02-14 at 23:03 +0100, Maciej Piekielniak wrote:

Hello Ken,

Tuesday, February 14, 2006, 10:30:34 PM, you wrote:
KH> On Tue, 2006-02-14 at 22:12 +0100, Maciej Piekielniak wrote:

>> Hello pgsql-sql,
>> 
>>   Is anybody know how create field in a new table with data type accuiring from a field in other table?
>>   For example:
>> 
>> create table new_table
>> ( 
>>  name other_table.name%TYPE
>> ); 
>> 

KH> Have you tried inheritance from one table to the new table?

KH> CREATE TABLE new_table (new_column)
KH>      INHERITS (old_table)

KH> All columns in 'old_table' will be inclueded in 'new_table' plus the
KH> column 'new_column'.

yes, but i don't need all colums, i need only the same data type for only
some fields.

for example
create table new table
(
 name other_table.name%TYPE,
 mynewfield VARCHAR(100),
 mynewfield2 VARCHAR(100)
);

Have you tried restructuring the table with CREATE TABLE AS...? Try this:

CREATE TABLE new_table
     (id, mynewfield, mynewfield2)
     AS SELECT id FROM old_table);

This should create a new table ('new_table') with the data-type for 'old_table' for the id column.