Обсуждение: how to set the value to the column

DM <dm.aeqa@gmail.com> wrote:

> Hi All,
>  
> I have a table test with columns name and value
>  
> test table
> name
> value
>  
> It has around 500 rows.
>  
> I added a new column id to the table,
>  
> Table test
> id,
> name,
> value
>  
> I am not sure how to insert numbers to my column id (1-500).

You can create a SEQUENCE and use this Sequence for that, an example:

test=# create table foo (name text);
CREATE TABLE
Zeit: 2,824 ms
test=*# copy foo from stdin;
Geben Sie die zu kopierenden Daten ein, gefolgt von einem Zeilenende.
Beenden Sie mit einem Backslash und einem Punkt alleine auf einer Zeile.
>> a
>> b
>> c
>> d
>> e
>> \.
Zeit: 5592,132 ms
test=*# create sequence foo_seq;
CREATE SEQUENCE
Zeit: 10,030 ms
test=*# alter table foo add column id int;
ALTER TABLE
Zeit: 0,347 ms
test=*# update foo set id = nextval('foo_seq');
UPDATE 5
Zeit: 0,379 ms
test=*# select * from foo;name | id
------+----a    |  1b    |  2c    |  3d    |  4e    |  5
(5 Zeilen)

Zeit: 0,241 ms
test=*#




Andreas
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