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Introduction to SQL

Introduction to SQL
The wildcard asterisk (*) is the SQL-92 standard for indicating "any sequence of characters."

True
False

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

True
False

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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
'AS' clause is used in SQL for

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

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Introduction to SQL
Which SQL statement is used to update data in a database?

SAVE AS
UPDATE
SAVE
MODIFY

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Introduction to SQL
Find all the cities whose humidity is 89

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

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