"on existing update" construct

From: Dev Kumkar <devdas(dot)kumkar(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: "on existing update" construct
Date: 2013-05-15 18:44:52
Message-ID: CALSLE1OKvEsQpGO7TWxcUyDFaeV0WOTFjyJGPmKD73bp1fn5gg@mail.gmail.com
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Hello,

Is there an alternative of Sybase "on existing update" construct in pgsql.

"ON DUPLICATE KEY UPDATE" doesn't work.

Thanks in advance!

Regards - Dev

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