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Introduction to SQL

Introduction to SQL
There is an equivalent join expression that can be substituted for all subquery expressions.

True
False

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Introduction to SQL
Find all the cities whose humidity is 89

SELECT humidity = 89 FROM weather;
SELECT city FROM weather WHERE humidity = 89;
SELECT city FROM weather;
SELECT city WHERE humidity = 89;

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Introduction to SQL
Most companies keep at least two versions of any database they are using.

False
True

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

XML
DML
DDL
HTML

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Introduction to SQL
SQL is a data sublanguage.

True
False

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Introduction to SQL
............. joins two or more tables based on a specified column value not equaling a specified column value in another table.

NATURAL JOIN
EQUIJOIN
NON-EQUIJOIN
OUTER JOIN

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