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Vague question, but if you are talking about a database field, the simple way is to create a unique index on the field (if the database supports it). The index will not allow duplicate values to be added to the database for that field and will generate an error if somebody tries.

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โˆ™ 2005-02-13 03:15:05
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Q: What are the ways of preventing duplicate values in a field?
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