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SQL subqueries that can occur wherever a value is permitted provided the subquery gives only one tuple with a single attribute are called _________

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SQL subqueries that can occur wherever a value is permitted provided the subquery gives only one tuple with a single attribute are called _________

(a) Exact Subqueries

(b) Vector Subqueries

(c) Positive Subqueries

(d) Scalar Subqueries

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My enquiry is from Nested Subqueries topic in section Introduction to Relational Model and Sql of RDBMS

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The correct choice is (d) Scalar Subqueries

The explanation is: SQL subqueries that can occur wherever a value is permitted provided the subquery gives only one tuple with a single attribute are called Scalar subqueries. Scalar Subqueries can be used in the SQL update statement when they are used under the set clause.

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