How to write a condition in FireBase where duplicate records will not be written?

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nikita_chiru2017-11-14 13:02:55

Angular

nikita_chiru, 2017-11-14 13:02:55

I want to check for id or something else ... so that the same records do not lie in the database ... how can I check for this?
ionic v2
angularfirebase 5

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