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10. Which type of join contains a USING clause to specify the equi-join condition A named column join 11. What are the two types of condition joins Inner and outer 12. What are the three types of outer joins Left, right, and full 13. Which type of condition join should you use if you want to return only matched rows A. Inner join B. Left outer join C. Right outer join D. Full outer join A is the correct answer. 14. Which type of condition join returns all matched and unmatched rows A. Inner join B. Left outer join C. Right outer join D. Full outer join D is the correct answer. 15. Which type of join contains an ON clause A. Cross join B. Comma-separated join C. Natural join D. Condition join D is the correct answer. 16. A(n) ____________ operator allows you to combine separate SELECT statements into one statement in order to join data in a query result. UNION 17. What keyword can you use with a UNION operator to return all rows in the query results, regardless of whether there are duplicate values ALL keyword
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1. In which types of statements can you include subqueries A. SELECT B. INSERT C. UPDATE D. DELETE A, B, C, and D are the correct answers. 2. What is a subquery A subquery is an embedded SELECT statement that acts as a gateway to data in a second table. The data returned by the subquery is used by the primary statement to meet whatever conditions have been defined for that statement. 3. In which clauses of a SELECT statement can you include a subquery A. SELECT B. WHERE C. GROUP BY D. HAVING A, B, and D are the correct answers. 4. Into what two general categories can you divide subqueries in a WHERE clause Subqueries that can return multiple rows and those that can return only one value 5. Which types of predicates are you prevented from using with subqueries that return multiple rows A. IN and EXISTS predicates B. SOME, ANY, and ALL predicates C. Comparison predicates D. Quantified comparison predicates C is the correct answer. 6. When does an EXISTS condition evaluate to true An EXISTS condition evaluates to true if one or more rows are returned by the subquery; otherwise, it evaluates to false. 7. What should be included in a subquery s search condition when using an EXISTS predicate The subquery of an EXISTS predicate should include a search condition that matches values in the two tables that are being linked through the subquery.
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8. In addition to numbers, ____________ data can be compared in comparison predicates. Character string 9. What are the three quantified comparison predicates SOME, ANY, and ALL 10. Which types of predicates allow you to use subqueries that return multiple rows A. IN and EXISTS predicates B. SOME, ANY, and ALL predicates C. Comparison predicates D. Quantified comparison predicates A, B, and D are the correct answers. 11. What is a correlated subquery A correlated subquery is one that is dependent on the outer statement in some way. 12. How often is a correlated subquery evaluated when a SELECT statement is processed The correlated subquery must be evaluated for each row returned by the outer SELECT statement. 13. A(n) ____________ is a subquery that is a component of another subquery. Nested subquery 14. How many subqueries can be included in a SELECT statement, as specified by the SQL standard The SQL:2006 standard does not limit the number of subqueries that can be included in a statement. 15. Which clause in an INSERT statement can contain a subquery VALUES clause 16. How many values can a subquery return if it is used in an INSERT statement One 17. Which clauses in an UPDATE statement can contain a subquery WHERE and SET
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