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Introduction to SQL

Introduction to SQL
SQL query and modification commands make up a(n) ________ .

XML
DML
DDL
HTML

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Introduction to SQL
A subquery in an SQL SELECT statement:

has a distinct form that cannot be duplicated by a join.
can always be duplicated by a join.
cannot have its results sorted using ORDER BY.
can only be used with two tables.

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Introduction to SQL
The benefits of a standard relational language include which of the following?

Applications are not needed
Reduced training costs
Increased dependence on a single vendor
All of these

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Introduction to SQL
SQL is a data sublanguage.

True
False

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Introduction to SQL
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

True
False

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Introduction to SQL
Which of the following is a SQL aggregate function?

LEN
AVG
LEFT
JOIN

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