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Introduction to SQL

Introduction to SQL
SQL is a data sublanguage.

False
True

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Introduction to SQL
The SELECT statement SELECT 'Hi' FROM DUAL WHERE NULL = NULL; Outputs

FLASE
Nothing
Hi
TRUE

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Introduction to SQL
Which of the following do you need to consider when you make a table in SQL?

All of these
Data types
Primary keys
Default values

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Introduction to SQL
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

False
True

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

True
False

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Introduction to SQL
The ADD command is used to enter one row of data or to add multiple rows as a result of a query.

False
True

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