Duplicate records behaviour in plsql developer

[MURALI KRISHNA]

how plsql developer decide two records are duplicate?

either data of all columns in a table are same or

it may focus on only key column if yes on which key column(primary/unique/)

in my table i have 10 columns and 2568 records in excel sheet
while i was trying to upload excel sheet data into table by
text importer it was telling 656 records were duplicates

but i have primary key column in that table not possible two records have same value in that column

how it displays 656 records were duplicates

thanks in advance....

 

[Marco Kalter]

Duplicates are determined based on the primary key constraint of the table.

 

[Claus Pedersen]

Murali: does your table have unique keys? This may also cause a 'duplicate row' error.