Relational set operator is either union or union all


Using the BOOKS and ORDER_ITEMS table, write a query using the correct Relational Set Operator that will show all of the Book IDs in the BOOKS table that have not been ordered.

Relational Set Operator is either UNION or UNION ALL

and UNION is just inbetween two SELECT statements, but this one is bugging me.

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Data Structure & Algorithms: Relational set operator is either union or union all
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