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Kuppa PoojithaKuppa Poojitha 

Hi I have to create a custom field which should be unique ID including numbers, letters and characters for an object. Suggest me which should be the type of the field. Thanks a lot in advance

You can create AUTONUMBER type. This will genearte auto number based on set format and it will be bydefault UNIQUE.
You can create a TEXT field and check the Unique checkbox on details on field.