LibreOffice 24.8 Help
In the Query Properties dialog you can set two properties of the SQL Query, i.e. whether to return distinct values, and whether to limit the result set.
In the Query Design View, choose Edit - Query Properties.
Expands the created select statement of the SQL Query in the current column by the parameter DISTINCT. The consequence is that identical values occurring multiple times are listed only once.
Adds a Limit to set the maximum number of records to return.