The following are all valid locations in an SQL query

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Question 1

The following are all valid locations in an SQL query for a subquery. According to the text, which is the most commonly used?

Question 1 options:

 

In the FROM clause as a virtual table

 

In the WHERE or HAVING clause as a subquery search condition

 

In the SELECT clause as a scalar value

 

In the ORDER BY clause as a sort order

Question 2

A subquery comparison as a condition in the WHERE clause can sometimes be used as an alternative to joining tables (i.e. both methods can sometimes be viable solutions). Which of the following is an advantage of using a subquery solution?

Question 2 options:

 

You can use a subquery to pass an aggregate calculation to the outer query

 

You can include columns from both tables in the output

 

The query will typically perform faster

 

Subquery solutions can be easier to code for short, simple queries

Question 3

The IN comparison can be used in SQL Server to compare a value against a list of hard-coded values; it can also be used to compare against a dynamically-generated list by using a subquery. Which of the following is true for this type of comparison?

Question 3 options:

 

The subquery must return a single column of values

 

The subquery must return a single row of values

 

The subquery must return a single value

 

The subquery must include a correlation

Question 4

When using a comparison operator (e.g. = > < >= <= etc.) against a subquery, the subquery must return a single value (one row, one column); otherwise an error will result. What is one method to make this type of comparison and avoid the error?

Question 4 options:

 

Convert numeric values to strings

 

Include multiple columns in your SELECT clause

 

Code the condition with one of the keywords ANYSOME, or ALL

 

Write the subquery using an aggregate calculation

Question 5

WHERE clause comparisons against a subquery can use comparison operators (e.g. + > < >= <= etc.). What is the effect when the ALL keyword is applied to this type of comparison?

Question 5 options:

 

The comparison will now be true when multiple rows are returned

 

The comparison will now be false if the subquery returns no rows

 

The condition must now be true for every value returned from the subquery

 

The condition can now be true for any value returned from the subquery

Question 6

WHERE clause comparisons against a subquery can use comparison operators (e.g. + > < >= <= etc.). TheANY and SOME keywords can be applied to this type of comparison to match part of the returned set of values. What is the functional difference between ANY and SOME?

Question 6 options:

 

None of the above; they are equivalent

 

ANY works only against the equality operator ( + )

 

The ANY comparison will typically return more values

 

The SOME comparison will typically return more values

Question 7

Which of the following are true about correlated subqueries when used in WHERE clause conditions? Check only those that apply:

Question 7 options:

 

When using the same table as the outer query, they require the use of an alias

 

They refer to a value provided by a column in the outer query

 

They are executed once for each row processed by the outer query

 

They typically run more efficiently than non-correlated subqueries

 

For testing, they can be executed independently from the outer query without modification

Question 8

Which of the following is true when using the EXISTS comparison against a subquery in the WHERE clause?

Question 8 options:

 

Values the subquery can be displayed in the output

 

You cannot use a correlation in the subquery

 

The subquery must SELECT only a single column

 

It resolves as true when the subquery returns any rows

Question 9

A subquery can be placed in the FROM clause of an outer query to act as a kind of "virtual" table (it must be assigned an alias, and all calculated values must be given labels). What is the name given to this type of subquery?

Question 9 options:

 

view table

 

formulated table

 

derived table

 

calculated table

Question 10

Which is true when using a subquery in the SELECT clause of an outer query?

Question 10 options:

 

They can return multiple columns, but only a single row

 

They can return any number of rows and columns

 

They must return only a single value

 

They can return multiple rows, but only a single column

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