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Theoretically, it is not possible to create multiple primary keys for a table. Hence I'm not able to create this type of table. Is any thing other than primary key is required to create such a table?
True that you can only have on primary key but you can create multiple indexes. I do not think your emp_info_name_key index can be defined as unique. However, I do not claim to be a database expert and I am not sure on what you are trying to accomplish so have a go here: http://www.postgresql.org/docs/8.1/i...e/indexes.html
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