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HASAN WAQAR A NON UNIQUE FIELD IS MADE UNIQUE AFTER IT ALREADY HAS SOME DATA IN IT WHAT HAPPENS TO DATA
Hi there:
If we had a email field that was not unique. but now we want to make it unique. what happens to existing data or record.
If we had a email field that was not unique. but now we want to make it unique. what happens to existing data or record.
If there is any duplicate record found then you can't make that field as unique. It will throw error message, when you are trying to make the field unique.Duplicate value(s) found when building unique index, example: sample on rows