Which SQL command is used to remove a database or table?

The command used to remove a database or table in SQL is the DROP command. This command completely removes the specified database or table, along with all of its data, structure, and associated objects. Once executed, the DROP command cannot be undone, and the data cannot be recovered unless a backup exists.

The ALTER command, on the other hand, is used to modify the structure of an existing database object, such as adding a new column to a table or changing a column's data type. This does not involve the removal of the object itself.

The DELETE command is used to remove specific records from a table based on a condition, but it does not delete the entire table or database. It allows for selective removal of data while keeping the table intact.

The CREATE command is used to create new databases, tables, or other objects in SQL. It is the opposite of DROP, as it establishes new objects rather than removing existing ones.

Understanding these distinctions helps clarify how each SQL command functions and when it is appropriate to use them in database management.