You are logged on to the database as a database user.
You are the owner of the table or have the DROPIN privilege for the schema to which the table belongs.
More information: SQL Reference Manual, Privilege Specification for a Schema (schema_priv_spec)
The database is in the ONLINE operational state.
You delete a table in the explorer tree.
To delete tables, you can also use SQL statements.
More information:
SQL Reference Manual, DROP TABLE Statement (drop_table_statement)