The "SELECT INTO" statement copies data from one table into a new table. The "INSERT INTO SELECT" statement copies data from one table and inserts it into another table.
The "SELECT INTO" statement creates a new table, while the "INSERT INTO SELECT" statement requires an existing table.
The "SELECT INTO" statement can copy all columns or only selected columns, while the "INSERT INTO SELECT" statement can also copy all columns or selected columns.
The "SELECT INTO" statement is commonly used for creating backup or temporary tables, while the "INSERT INTO SELECT" statement is used to transfer data between existing tables.