Final answer:
The keywords ALTER TABLE, ALTER COLUMN, MODIFY, and SET DEFAULT can all be used to change the size, datatype, and/or default value of an existing column.
The answer is option 5.All of the above
Step-by-step explanation:
Let's break down each keyword:
- 1. ALTER TABLE: The ALTER TABLE statement is used to modify the structure of a table. It allows you to add, modify, or drop columns in an existing table.
- 2. ALTER COLUMN: When combined with the ALTER TABLE statement, the ALTER COLUMN keyword allows you to modify the properties of a specific column in the table. This includes changing the size, datatype, and default value.
- 3. MODIFY: The MODIFY keyword is used in conjunction with the ALTER COLUMN keyword to change the size, datatype, or default value of an existing column. It is part of the ALTER TABLE... ALTER COLUMN statement.
- 4. SET DEFAULT: The SET DEFAULT keyword is used to change the default value of an existing column. It is used in combination with the ALTER TABLE... ALTER COLUMN statement to specify a new default value for the column.
Therefore, The answer is option 5.All of the above
Your question is incomplete, but most probably the full question was:
Which of the following keywords can be used to change the size, datatype, and/or default value of an existing column?
- ALTER TABLE
- ALTER COLUMN
- MODIFY
- SET DEFAULT
- All of the above