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Introduction to SQL

Introduction to SQL
Which of the following group functions ignore NULL values?

All of these
MAX
COUNT
SUM

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Introduction to SQL
Find all the cities whose humidity is 89

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

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Introduction to SQL
The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows.

False
True

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Introduction to SQL
The command to remove rows from a table 'CUSTOMER' is:

DELETE FROM CUSTOMER WHERE ...
REMOVE FROM CUSTOMER ...
DROP FROM CUSTOMER ...
UPDATE FROM CUSTOMER ...

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

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.

EQUIJOIN
NON-EQUIJOIN
OUTER JOIN
NATURAL JOIN

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