Question 1

When a multiple-column subquery is used in the outer query's FROM clause,it creates a temporary table,called an inline view,that can be referenced by other clauses of the outer query.​

Accepted Answer

This statement is true. A multiple-column subquery in the FROM clause of the outer query creates a temporary table (also known as an inline view) that can be referenced by other clauses of the outer query. This allows for more complex queries that involve joining or filtering multiple tables.

Question 2

A subquery is a complete query nested inside another query.

Accepted Answer

A subquery is indeed a complete query that is nested inside another query.

Question 3

​The results of the outer query are passed to the inner query.

Accepted Answer

The inner query is executed first and the results are passed to the outer query. This is known as a subquery or nested query.

Question 4

A multiple-column subquery cannot be nested in a WHERE clause.​

Accepted Answer

A multiple-column subquery can indeed be nested in a WHERE clause, typically used for comparison purposes with multiple columns in the outer query.

Question 5

A group function cannot be included in the SELECT clause of a single-row subquery.​

Accepted Answer

Group functions can be included in the SELECT clause of a single-row subquery, but the subquery must return only one row.

Question 6

The <ALL operator indicates that for a value to be included in the results,it must be less than the lowest value returned by the subquery.​

Accepted Answer

The <ALL operator indicates that for a value to be included in the results, it must be less than all the values returned by the subquery.

Question 7

The EXISTS operator can be used with multiple-row subqueries.​

Accepted Answer

The EXISTS operator can be used with both single-row and multiple-row subqueries.

Question 8

When a multiple-column subquery is used in the WHERE clause of the outer query,the column names listed on the left side of the comparison operator must be enclosed in double-quotation marks.​

Accepted Answer

The column names listed on the left side of the comparison operator in a multiple-column subquery do not need to be enclosed in double-quotation marks when used in the WHERE clause of the outer query. Single-quotation marks may be used for string comparisons. However, if the column name contains spaces or special characters, it should be enclosed in double-quotation marks or square brackets.

Question 9

A multiple-row subquery can be nested in a HAVING clause.​

Accepted Answer

A multiple-row subquery can be used in the HAVING clause, which applies aggregate conditions to groups of rows rather than to individual rows.

Question 10

When used with a multiple-row subquery,the IN operator indicates that the records processed by the outer query must match one of the values returned by the subquery.​

Accepted Answer

This is the correct definition and usage of the IN operator with a multiple-row subquery.

Question 11

Valid single-row operators include =,>,<,>=,<=.

Accepted Answer

Valid single-row operators for comparison in SQL include = (equal to), > (greater than), < (less than), >= (greater than or equal to), and <= (less than or equal to).

Question 12

A correlated subquery references one or more columns in the outer query,and the EXISTS operator is used to test whether the relationship or link is present.​

Accepted Answer

This is an accurate description of a correlated subquery.

Question 13

​If a subquery is nested in a HAVING clause,the subquery must be on the right side of the comparison operator.

Accepted Answer

This statement is true. When a subquery is used in a HAVING clause, it must be on the right side of the comparison operator.

Question 14

Multiple-row subqueries are nested queries that can return more than one row of results to the parent query.​

Accepted Answer

Multiple-row subqueries can return more than one row of results to the parent query.

Question 15

​A single-row subquery can return several columns,but only one row,of results to the outer query.

Accepted Answer

The answer of ​A single-row subquery can return several columns,but...

Question 16

Single-row operators can be used with multiple-row subqueries that return only one column of results.​

Accepted Answer

The answer of Single-row operators can be used with multiple-row...

Question 17

The equal sign,=,is a valid single-row operator.​

Accepted Answer

The equal sign, =, is a valid single-row operator in programming, mathematics and logic. It is used to assign a value to a variable or to test for equality between two values.

Question 18

A subquery nested in a SELECT clause cannot contain an ORDER BY clause.​

Accepted Answer

Subquery in SELECT can return only one value or a single row. Therefore, it does not make sense to use the ORDER BY clause, as the result set is already limited to one row.

Question 19

A subquery can only be nested in the WHERE or HAVING clause of the outer query.​

Accepted Answer

Subqueries can be nested in various parts of the outer query, including the SELECT, FROM, and WHERE clauses, not just the WHERE or HAVING clauses.

Question 20

A single-row subquery can be nested in the SELECT clause of the outer function.​

Accepted Answer

A single-row subquery can be used in the SELECT clause of the outer query to retrieve a single value that can be used in further calculations or comparisons. This type of subquery returns only one row and one column. It can also be used with operators like =, >, <, etc. Nested subqueries can also be used to retrieve more complex data or multiple values.

Quiz 12: Subqueries and Merge Statements

When a multiple-column subquery is used in the outer query's FROM clause,it creates a temporary table,called an inline view,that can be referenced by other clauses of the outer query.​

A subquery is a complete query nested inside another query.

​The results of the outer query are passed to the inner query.

A multiple-column subquery cannot be nested in a WHERE clause.​

A group function cannot be included in the SELECT clause of a single-row subquery.​

The <ALL operator indicates that for a value to be included in the results,it must be less than the lowest value returned by the subquery.​

The EXISTS operator can be used with multiple-row subqueries.​

When a multiple-column subquery is used in the WHERE clause of the outer query,the column names listed on the left side of the comparison operator must be enclosed in double-quotation marks.​

A multiple-row subquery can be nested in a HAVING clause.​

When used with a multiple-row subquery,the IN operator indicates that the records processed by the outer query must match one of the values returned by the subquery.​

Valid single-row operators include =,>,<,>=,<=.​

A correlated subquery references one or more columns in the outer query,and the EXISTS operator is used to test whether the relationship or link is present.​

​If a subquery is nested in a HAVING clause,the subquery must be on the right side of the comparison operator.

Multiple-row subqueries are nested queries that can return more than one row of results to the parent query.​

​A single-row subquery can return several columns,but only one row,of results to the outer query.

Single-row operators can be used with multiple-row subqueries that return only one column of results.​

The equal sign,=,is a valid single-row operator.​

A subquery nested in a SELECT clause cannot contain an ORDER BY clause.​

A subquery can only be nested in the WHERE or HAVING clause of the outer query.​

A single-row subquery can be nested in the SELECT clause of the outer function.​

When a multiple-column subquery is used in the outer query's FROM clause,it creates a temporary table,called an inline view,that can be referenced by other clauses of the outer query.

The results of the outer query are passed to the inner query.

A multiple-column subquery cannot be nested in a WHERE clause.

A group function cannot be included in the SELECT clause of a single-row subquery.

The <ALL operator indicates that for a value to be included in the results,it must be less than the lowest value returned by the subquery.

The EXISTS operator can be used with multiple-row subqueries.

When a multiple-column subquery is used in the WHERE clause of the outer query,the column names listed on the left side of the comparison operator must be enclosed in double-quotation marks.

A multiple-row subquery can be nested in a HAVING clause.

When used with a multiple-row subquery,the IN operator indicates that the records processed by the outer query must match one of the values returned by the subquery.

Valid single-row operators include =,>,<,>=,<=.

A correlated subquery references one or more columns in the outer query,and the EXISTS operator is used to test whether the relationship or link is present.

If a subquery is nested in a HAVING clause,the subquery must be on the right side of the comparison operator.

Multiple-row subqueries are nested queries that can return more than one row of results to the parent query.

A single-row subquery can return several columns,but only one row,of results to the outer query.

Single-row operators can be used with multiple-row subqueries that return only one column of results.

The equal sign,=,is a valid single-row operator.

A subquery nested in a SELECT clause cannot contain an ORDER BY clause.

A subquery can only be nested in the WHERE or HAVING clause of the outer query.

A single-row subquery can be nested in the SELECT clause of the outer function.