Question

When including a subquery in an INSERT command, the syntax of enclosing the subquery in parentheses is mandatory.

a) True
b) False

Answer 1

The statement is true; in SQL, when including a subquery in an INSERT command, enclosing the subquery in parentheses is mandatory to define the subquery's boundaries.

Step-by-step explanation:

When using a subquery within an INSERT statement, the syntax indeed requires that the subquery is enclosed within parentheses. This is because the subquery can return a set of rows or a scalar value that is then used in the insert operation. The parentheses help to define the boundaries of the subquery, ensuring that it is treated as a single unit within the larger INSERT command.

For example, if we wanted to insert values into a table named table1 from another table named table2, we might use a command like:

INSERT INTO table1 (column1, column2) SELECT column1, column2 FROM table2 WHERE condition;

In this case, the part of the command following the SELECT statement is the subquery, and as per standard SQL syntax, it is enclosed in parentheses.