Prevent duplication in new records
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Trigger to prevent duplication of records in Salesforce
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Duplicate id in list
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Many To many for Bulk records
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Optimal way to ignore duplicate inserts?
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How do I delete unique rows from a table with duplicate keys?
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prevent user creating a duplicate node title
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Merge duplicate records into 1 field
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Disable Material Duplication
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How to prevent duplicate records being inserted with SqlBulkCopy when there is no primary key
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"Please ask a new question" encourages question repetition for duplicates
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Validation Rule to prevent editing record
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Display error message if same record exist with combination of some fields?
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Remove duplicate values from query result
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How to remove non-duplicate records in Excel-2010
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Remove duplicate entries, keeping latest only
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Hitting Standard Duplicate Rule
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remove duplicating fields in php-mysql result rows