Final answer:
The statement '-psql -c mydatabase' and '-psql -d mydatabase' would clean the data prior to restoring the database 'mydatabase', while '-psql -a mydatabase' and '-psql mydatabase' would not clean the data.
Step-by-step explanation:
The statement -psql -c mydatabase would clean the data prior to restoring the database mydatabase. This command executes a single SQL command directly without needing to enter the interactive shell. You can specify a SQL command like 'TRUNCATE TABLE' or 'DELETE FROM TABLE' to remove data from the tables before restoring the database.
Additionally, the statement -psql -d mydatabase can also help clean the data before restoring the database. This command connects directly to the specified database (mydatabase) and allows you to execute SQL commands to clean or modify the data.
On the other hand, -psql -a mydatabase and -psql mydatabase are not specific commands that clean the data prior to restoring the database.