Old table structure is similar to the new table, but the new table a field with the only restriction, is not the only constraint in the old table, how to deal with duplicate data

CodePudding user response:

This is a business requirement is not technical requirements, ask, head of the business

CodePudding user response:

Either lost behind duplicate data or remove the only constraint

CodePudding user response:

This kind of problem often encountered in the data migration, usually approach is to filter out duplicate data, let the customer to clean up,