A table underneath another one - Mailing list pgsql-general

From Jose Antonio Leo
Subject A table underneath another one
Date
Msg-id AEEGKNMMPPBJJDLEJDODOENNCJAA.jaleo@bmpcenter.com
Whole thread Raw
List pgsql-general
Hi to all,
I have three tables, one reflects article sales, another article purchases and another article regulations.
I would like to make a pursuit of a concrete article from an initial date to another end and to see his history.
The three tables agree in the following fields
    code_article, date, units, .......
 
In order to make a pursuit it would have to unite the three tables ordering per dates and later to select the rank of dates selec.
 
How I can do this? How I can to place a table underneath another one?
 
Tk very much.

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