Question: A subquery can only return one row of data unless you use this keyword. UNION IN NATURAL JOIN SELECT Which of the following is true

A subquery can only return one row of data unless you use this keyword.

UNION

NATURAL JOIN

SELECT

Which of the following is true of columns?

They must be of a static size

They must be created as NOT NULL

They must be referenced

They must be named

A primary key is defined by which attributes?

Unique and constrained

Constrained and named

Unique and not null

Unique and named

QUESTION 52

When normalising from second to third normal form, we would typically have:

none of the above

more data stored

less data stored

more relations

less relations

Which of the following is a good motivation to use a document database?

All the relationship types in the ERD are recursive

There is a large volume of data, and therefore it needs to be distributed

There is only one entity type, and no relationship types

Many attributes are long text descriptions, and several attributes are optional

When considering a DBMS for a company that performs thousands of money transactions per month, which of the following is most important?

		ACID
		24x7 support
		SQL-92
		The DBMS server

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