Duplicates Another popular criticism is that it allows duplicate rows, making integration with languages such as Python, whose data types might make accurately representing the data difficult, in terms of parsing and by the absence of modularity. This is usually avoided by declaring a primary key, or a unique constraint, with one or more columns that uniquely identify a row in the table.
duplicates another popular criticism is that it allows duplicate rows making integration with languages such as python whose data types might make accurately representing the data difficult in terms of parsing and by the absence of modularity this is usually avoided by declaring a primary key or a unique constraint with one or more columns that uniquely identify a row in the table