How to know which field is not unique when adding postgreSQL?

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KIKIMIKI2015-09-19 23:42:34

PostgreSQL

KIKIMIKI, 2015-09-19 23:42:34

There is a table in which 4 fields marked "unique". When you try to add a non-unique field, the database swears, but does not say which field is not unique.
How can you find out what field it is?

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