How can I insert NULL into column with the type of timestamp?

On Tue, Dec 11, 2007 at 10:29:04AM +0800, bookman bookman wrote:

So it means that the column with type timestamp cannot accept a NULL
.Is there any way I can tansfer this table into postgre?How can i deal
with NULL in this case?

NULL values are encoded as an unquoted \N by default in PG. You've got
a few ways of fixing things then. Tell MS-SQL to do the same, write a
sed script to do the translation, or use the "NULL AS 'NULL'" option in
the COPY command.

Sam

bookman bookman escribi�:

Then error occured:
error:invalid input syntax for type timestamp:""
context:copy T_Admin ,line 2,column regDate:""
It seemed that the column REGDATE cannot accept a NULL.I tested it use:
insert into T_Admin(name,key,regDate,isLock,realName)
values('aaa','aaa','','1','aaa');
The same error occured.

So it means that the column with type timestamp cannot accept a NULL
.Is there any way I can tansfer this table into postgre?How can i deal
with NULL in this case?

No, it doesn't mean that. It means that you are trying to insert an
empty string. Try this:

insert into T_Admin(name,key,regDate,isLock,realName)
values('aaa','aaa',NULL,'1','aaa');

Similarly, the NULL timestamp column in the file you give to COPY should
not contain empty quotes.

--
Alvaro Herrera http://www.advogato.org/person/alvherre
"Crear es tan dif�cil como ser libre" (Elsa Triolet)

Hello

use simply NULL

postgres=# create table bb(a timestamp, b integer);
CREATE TABLE
postgres=# insert into bb values(null, null);
INSERT 0 1
postgres=# insert into bb values(null, 10);
INSERT 0 1
postgres=# insert into bb values(current_timestamp, 10);
INSERT 0 1
postgres=# copy bb to stdout;
\N \N
\N 10
2007-12-12 16:48:28.122776 10
or
postgres=# copy bb to stdout with null as 'null';
null null
null 10
2007-12-12 16:48:28.122776 10

Regards
Pavel Stehule

Actually what you are doing below is trying to stuff '' in a timestamp
field.

Keep in mind '' and NULL are not the same. '' is invalid for timestamp
where as NULL is fine. Your example should be
insert into T_Admin(name,key,regDate,isLock,realName)
values('aaa','aaa',NULL,'1','aaa');

I think the bcp is trying to insert 'NULL' instead of NULL.

According to the docs - looks like you can tell copy that
http://www.postgresql.org/docs/techdocs.15

So my guess is you should do
copy t_admin from "/home/postgres/data/admin.txt" USING DELIMITERS '\t'
WITH NULL As 'NULL'

Hope that helps,
Regina

-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of bookman bookman
Sent: Monday, December 10, 2007 9:29 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] How can I insert NULL into column with the type of
timestamp?

H i ,

I want to tansfer a database from sqlserver2005 to postgresql8.2.5.I
use bcp to export a table named admin in sqlserver to a text file:

--table T_admin
id name key regDate
isLock realName
1 rison 998877 2007-08-27 10:24:57 False
admin
2 lijun 778899 NULL
False NULL
3 guanliyuan 111111 2007-11-05 10:30:08 False
myAdmin

--admin.txt
id name key regDate
isLock realname
1 ris 998877 2007-08-27 10:24:57.000 0 admin
2 lij 778899 0
3 guanliyuan 111111 2007-11-05 10:30:08.813 0
myAdmin

I created a table in postgresql,and I use "copy" to import datas

create table T_Admin(
adminID serial not null primary key,
name varchar(30) null,
key varchar(30) null,
regDate timestamp null,
isLock bool null,
realName varchar(30) null
)

copy admin from "/home/postgres/data/admin.txt"

Then error occured:
error:invalid input syntax for type timestamp:""
context:copy T_Admin ,line 2,column regDate:""
It seemed that the column REGDATE cannot accept a NULL.I tested it use:
insert into T_Admin(name,key,regDate,isLock,realName)
values('aaa','aaa','','1','aaa');
The same error occured.

So it means that the column with type timestamp cannot accept a NULL
..Is there any way I can tansfer this table into postgre?How can i deal
with NULL in this case?
Thank you!

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2007/12/12, Obe, Regina <robe.dnd@cityofboston.gov>: