Edit C:\Program Files (x86)\PostgreSQL\9.5\pgAdmin III\docs\en_US\hints\view-without-pk.html
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="STYLESHEET" type="text/css" href="../pgadmin3.css"> <title>Guru Hints</title> </head> <body> <h3>Edit table data without primary key</h3> <p> Since the table <INFO> doesn't have a primary key or OIDs, you can view the data only. Inserting new rows and changing existing rows isn't possible for the Edit Data tool without primary key. </p> <p> In order to edit data, pgAdmin III requires a primary key on the table, which is a good database design practice anyway. Alternatively, the table can be created WITH OIDS. Please note that oids are <B>not</B> guaranteed to be unique over a very long period of time, so using oids as kind-of primary key is only second choice. </p> </body> </html>
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