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A command that adds, deletes or modifies columns in an existing table is:

AAUDIT TABLE
BADJUST TABLE
CASSIGN TABLE
DALTER TABLE
Answer & Solution
Correct answer: D. ALTER TABLE
1. The table already exists. 2. Its column list needs changing. 3. That command is ALTER TABLE. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._
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