Discussion
What SQL command can be used to add columns to a table?
Answer: D
Correct answer: ALTER TABLE TableName ADD ColumnName
Adding a column is done with ALTER TABLE, and in most implementations the keyword COLUMN is optional on the ADD clause though required on DROP COLUMN. MODIFY TABLE is not a command in any dialect. Note also that a column added with a NOT NULL constraint and no default will fail on a table that already contains rows.
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