⇒ The SELECT DISTINCT statement is used to return only distinct (different) values. Simply put, it is used to return only unique values.
⇒ The DISTINCT clause is used to remove duplicates from the result set of a SELECT statement. Within a table, a column often contains many duplicate values, and sometimes you only want to list the different (distinct) values.
Notes:
⇒ When only one column (expression) is provided in the DISTINCT clause, the query will return the unique values for that column.
⇒ When more than one column (expression) is provided in the DISTINCT clause, the query will retrieve unique combinations for the columns listed.
⇒ In SQL, the DISTINCT clause doesn't ignore NULL values. So when using the DISTINCT clause in your SQL statement, your result set will include NULL as a distinct value.
By correcting spelling mistakes, grammar mistakes, and conceptual errors, this version provides a clear and accurate explanation of the SELECT DISTINCT statement and its usage.
