Which SQL Query is used to remove a table and all its data from the database ?

Question

Accepted Answer

The correct option is (3):
The Structured Query Language (SQL) command specifically designed to permanently remove a table definition and all its corresponding data, indexes, constraints, and other associated objects from the database is DROP TABLE. This command belongs to the Data Definition Language (DDL) set, which means it deals with the database's schema or structure, not the data content itself. When you execute DROP TABLE, the entire table object is completely eradicated from the system catalog, making the action fast and, typically, irreversible without a backup, as it is implicitly committed by most database systems. It is the ultimate command for definitive table removal.

The incorrect option is (1):
The CREATE TABLE statement is fundamentally a DDL command used for the opposite purpose: to define and build a new table structure within the database. Its function is to specify the table name, define all column attributes (data types, sizes), and establish any necessary constraints (like Primary Keys or Foreign Keys). Therefore, instead of removing a table and its data, CREATE TABLE is the first step in setting up a new container to store data. It does not affect any existing tables in the database, making it an entirely incorrect choice for the goal of removing data and structure.

The incorrect option is (2):
The ALTER TABLE command is a DDL operation used to modify the existing structure of a table, not to remove the entire object. For example, you would use ALTER TABLE to add a new column, drop an existing column, or add a constraint to a table that already exists. While it changes the table's definition, it meticulously preserves the table object itself and, crucially, all the data rows it contains, unless a column containing data is explicitly dropped. Since the goal is to remove the entire table and its data, ALTER TABLE is inappropriate.

The incorrect option is (4):
The option None of three is incorrect because the correct SQL query for the operation is definitively provided as Option 3, DROP TABLE. The query asks for the command that removes both the table and all its data. It is important to note that commands like DELETE FROM only remove the data (rows) while leaving the table structure intact, and TRUNCATE TABLE removes all data quickly but also leaves the table structure intact. Since DROP TABLE correctly performs the required function of removing both structure and data, it is the correct answer, which negates the possibility of 'None of three'.