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Introduction to SQL

Introduction to SQL
'AS' clause is used in SQL for

Join operation.
Rename operation.
Selection operation.
Projection operation.

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Introduction to SQL
A subquery in an SQL SELECT statement is enclosed in:

parenthesis -- (...) .
brackets -- [...].
CAPITAL LETTERS.
braces -- {...}.

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Introduction to SQL
COUNT(field_name) tallies only those rows that contain a value; it ignores all null values.

False
True

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Introduction to SQL
SQL data definition commands make up a(n) ________ .

DDL
HTML
DML
XML

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Introduction to SQL
The Microsoft Access wildcards are ____ and ____ .

percent sign (%); underscore (_)
question mark (?); asterisk (*)
asterisk (*); percent sign (%)
underscore(_); question mark (?)

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

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

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