Re: How to compare two tables in PostgreSQL

If you would like to compare their contents perhaps this may help.
Write a select statement containing the fields for which you would like to
compare data for, you may want to leave out fields whose values are
provided by default for example fields populated from sequence object
and/or timestamp fields.
You may need to include triming of leading and trailing empty spaces for
the text based fields if such white spaces are not relevant for your
defination of similarity.
The same may apply on rounding and formatting numeric data for example
9.900 could be equivalent to 9.9 in the other table based on your
application of the data.
Include an ORDER BY clause to ensure you get the records in a predictable
order.
Output these data to a CSV file without the CSV header.
Now rewrite the same query for the other table, this is required if the
table definations are not common between the two tables.
Remember to substitute the table name accordingly.
Output these data to another CSV file without the CSV header.

Now run sha1sum on the first file and compare the returned sha1sum value
with the value returned on running sha1sum with the second file.
Perhaps use "diff" tool.

Allan.

On Mon, Nov 12, 2012 at 10:23 AM, Rob Sargentg <robjsargent(at)gmail(dot)com>wrote:

> On 11/10/2012 08:13 PM, saikiran mothe wrote:
>
>> Hi,
>>
>> How can i compare two tables in PostgreSQL.
>>
>> Thanks,
>> Sai
>>
> Compare their content or their definition?
>
>
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