Обсуждение: How to compare two tables in PostgreSQL

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?

Hi,

On Sun, 2012-11-11 at 08:43 +0530, saikiran mothe wrote:
> How can i compare two tables in PostgreSQL.

http://pgfoundry.org/projects/pg-comparator/

Open source, under active development.

Regards,
--
Devrim GÜNDÜZ
Principal Systems Engineer @ EnterpriseDB: http://www.enterprisedb.com
PostgreSQL Danışmanı/Consultant, Red Hat Certified Engineer
Community: devrim~PostgreSQL.org, devrim.gunduz~linux.org.tr
http://www.gunduz.org  Twitter: http://twitter.com/devrimgunduz

From: saikiran mothe [mailto:saikiran.mothe@gmail.com]
Sent: Saturday, November 10, 2012 10:14 PM
To: pgsql-sql@postgresql.org
Subject: How to compare two tables in PostgreSQL

Hi,

How can i compare two tables in PostgreSQL.

Thanks,
Sai


Here is simple sql to show data in table1, but not in table2:

SELECT <common_column_list> from table1
EXCEPT
SELECT <common_column_list> from table2;

And this sql shows data in table2 but not in table1:

SELECT <common_column_list> from table2
EXCEPT
SELECT <common_column_list> from table1;

Or, you could combine them in one statement, adding "indicator" column:

SELECT <common_column_list>, 'not in table2' as indicator from table1
EXCEPT
SELECT <common_column_list>, 'not in table2' as indicator from table2
UNION
SELECT <common_column_list>, 'not in table1' as indicator from table2
EXCEPT
SELECT <common_column_list>, 'not in table1' as indicator from table1;



Regards,
Igor Neyman

NOTE: SIMILAR TABLES -- Ignore if it doesn't meet your requirement.

If you like to compare the structure of the similar tables, then prefer
below example which will help you in locating the missing/additional column.
Consider we have these two tables on different schema. 

Table: 1 : billing_name
columns: no, name, invid, amount

Table 2: billing_name
columns: no,name,invid

*select * from (select column_name from information_schema.columns where
table_schema = 'TEST' and table_name like 'billing_name')
WHERE column_name NOT IN 
(select column_name from information_schema.columns where table_schema =
'public' and table_name like 'billing_name');*

*Result Set: amount*

Then, you can use any function/SP to dynamically pick the datatype and alter
column on run time. 

Thank you for your time.

Kamal



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