Which DDL command is not used to modify the data type of a column in a table?a.ALTER COLUMNb.UPDATE COLUMNc.MODIFY COLUMNd.CHANGE COLUMN
Question
Which DDL command is not used to modify the data type of a column in a table?
- a.
ALTER COLUMN - b.
UPDATE COLUMN - c.
MODIFY COLUMN - d.
CHANGE COLUMN
Solution
The DDL (Data Definition Language) command that is not used to modify the data type of a column in a table is b. UPDATE COLUMN.
Here's why:
a. ALTER COLUMN: This is used in SQL Server to modify the data type of a column in a table.
b. UPDATE COLUMN: This is not a valid DDL command in SQL. The UPDATE command is used to modify existing records in a table, not to change the data type of a column.
c. MODIFY COLUMN: This is used in Oracle SQL to modify the data type of a column in a table.
d. CHANGE COLUMN: This is used in MySQL to modify the data type of a column in a table.
So, the correct answer is b. UPDATE COLUMN.
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