Which command is used to add, change, or remove fields on an existing table?answerCREATE TABLEALTER TABLEINSERT INTODROP TABLE

Breakdown of the Problem

1. Identify the commands presented in the question.
2. Determine the function of each command in SQL.

Relevant Concepts

• CREATE TABLE: This command is used to create a new table in the database.
• ALTER TABLE: This command is used to modify an existing table. This includes adding, changing, or removing fields (columns).
• INSERT INTO: This command is used to add new records to a table.
• DROP TABLE: This command is used to delete a table and all of its data from the database.

Analysis and Detail

• Given the definitions of these commands, we can see that:
  • ALTER TABLE is the only command that allows for changes to be made to the structure of an existing table, specifically for adding, changing, or removing fields.

Verify and Summarize

• The question is asking specifically about modifying fields of an existing table, and the command that performs this function is ALTER TABLE.

Final Answer

The correct command to add, change, or remove fields on an existing table is ALTER TABLE.