The document explains the use of the SQL 'SELECT DISTINCT' statement, which returns unique values from a database query. It eliminates duplicates from the results and can be applied to a single column, but not multiple columns. This functionality allows users to retrieve unique records from a table.

1. Solution
:
The SELECT DISTINCT stamen will returns distinct values. SELECT DISTINCT statement
will eliminates the duplicates from the result. DISTINCT can be used for single column, it does
not support the multiple columns. Using this we can get the unique record from the table instead
of duplicate records.