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Advanced SQL

Advanced SQL
A correlated subquery is where the outer query depends on data from the inner query.

True
False

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Advanced SQL
There should be one condition within the WHERE clause for each pair of tables being joined.

False
True

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Advanced SQL
What type of join is needed when you wish to include rows that do not have matching values?

All of these
Natural join
Outer join
Equi-join

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Advanced SQL
Which of the following statements is true concerning subqueries?

Involves the use of an inner and outer query.
Does not start with the word SELECT.
All of these
Cannot return the same result as a query that is not a subquery.

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Advanced SQL
The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;

Cartesian join
Equi-join
Outer join
Natural join

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Advanced SQL
The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.

False
True

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