Help on restoration

Hi,

How to take dump based of condition i.e using where clauses in postgres?

For example i want to take dump of 1 week data from my table y and
import that 1 week data in to the same table after truncating the table

my table name is y having field name date and my query is of select
* from y where date >'2006-04-12';

how should i import the data taken using select statement using where
condition in postgres.

Regards,
Dhandapani.
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