SMB DataLoader : Duplicate Entries in table when same file is moved twice to same staging area

When same file is uploaded twice then it inserts duplicate entry in the table.

Step 1: Click Local File tab, click browse and upload a Sample_business_location.csv file.
Step 2: Click Load button.
Step 3: Select Staging Area say Test and Move file from local to selected staging Area.
Step 4: Open the database and execute following queries.
> use Test;
> Show tables;
> Select count from businessLocations; # Get the count of number of rows.
> Select * from businessLocations; # Displays the records.
Step 5: Upload same file Sample_business_location.csv.
Step 6: Click Load button.
Step 7: Already Staging Area is selected Test, just Move file from local to staging Area.
Step 8: Open the database and execute following queries.
> use Test;
> Show tables;
> Select count from businessLocations; # Get the count of number of rows.
> Select * from businessLocations; # Displays the records with duplicate entries.

Actual Result
Inserting Duplicate entries in the table.

Expected Result
No Duplicate entry should happen

Please find attached file.