Re: Comparing tables in different db's

Phillip F Jansen wrote:
>I would like to know if there is a way to compare the data of tables in
>different databases. For example I have table in db1 and exactly the
>same table in db2. Is it possible to see if the contents of the two
>tables are exactly the same?
>For example if the table(db1.customer) has a column surname and the
>field has a value of "Testing" and in db2.customer the exact same row
>has a value "Testong" is it possible to actually know that there is a
>difference ? I don't actually have to know what the actual differences
>are , I must just know that there is a difference.

You can't do it inside PostgreSQL. However, this shell script will do it:

psql -d db1 -tc "SELECT surname FROM customer WHERE id = 'xxx'" >db1.out
psql -d db2 -tc "SELECT surname FROM customer WHERE id = 'xxx'" >db2.out
if ! diff db1.out db2.out >/dev/null
then
echo Databases differ
fi
rm db[12].out

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Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
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