What SQL command is used to add a new column to an existing table?OptionsINSERT COLUMNALTER TABLEADD COLUMNCREATE COLUMN

Analysis of Options

1. INSERT COLUMN: This option is incorrect as the INSERT command is used to add new rows to a table, not columns.
2. ALTER TABLE: This is the correct command used to modify an existing table structure, including adding new columns.
3. ADD COLUMN: This is not a standalone SQL command; instead, it is a part of the ALTER TABLE syntax.
4. CREATE COLUMN: This option is incorrect since there is no such SQL command; you do not create a column independently of a table.

Final Answer

The SQL command used to add a new column to an existing table is:

ALTER TABLE <table_name> ADD COLUMN <column_name> <data_type>;

Thus, the correct choice from the provided options is ALTER TABLE.