Sql Unique Result Set. The difference between DISTINCT clause and GROUP BY clause is that the GROUP BY clause sorts the result set whereas the DISTINCT clause does not. To remove the duplicates the database system first sorts the result set by every column specified in the SELECT clause.
It could result in a one row one column output or a 100 column million row output. Notice that MySQL 80 removed the implicit sorting for the GROUP BY clause. The javasqlResultSet interface represents the result set of a database query.
The following SQL statement selects ALL including the duplicates values from the Country column in the Customers table.
SQL Select unique column from result set of complex query. The SELECT DISTINCT command returns only distinct different values in the result set. The following SQL statement selects ALL including the duplicates values from the Country column in the Customers table. EMPID Should be unique taking the latest.