How to specify a column alias?

  1. Place the alias at the beginning of the statement to describe the table.

  2. Place the alias after each column, separated by white space, to describe the column

  3. Place the alias after each column, separated by a comma, to describe the column.

  4. Place the alias at the end of the statement to describe the table.

  5. Place the alias at the end of where clause to describe each table


Correct Option: B

AI Explanation

To specify a column alias in a SQL statement, you can use option B, which involves placing the alias after each column, separated by white space, to describe the column.

Let's go through each option to understand why it is correct or incorrect:

Option A) Place the alias at the beginning of the statement to describe the table - This option is incorrect because column aliases are used to rename individual columns, not the entire table.

Option B) Place the alias after each column, separated by white space, to describe the column - This option is correct. In SQL, you can use the "AS" keyword followed by the alias name after each column to specify a column alias.

Option C) Place the alias after each column, separated by a comma, to describe the column - This option is incorrect because column aliases in SQL are typically separated by white space, not commas.

Option D) Place the alias at the end of the statement to describe the table - This option is incorrect because, as mentioned earlier, column aliases are used to rename individual columns, not the entire table.

Option E) Place the alias at the end of the WHERE clause to describe each table - This option is incorrect because column aliases are not typically used in the WHERE clause. They are used to rename columns in the SELECT clause.

Therefore, the correct answer is option B.

Find more quizzes: