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Introduction to SQL

Introduction to SQL
SQL provides five built-in functions: COUNT, SUM, AVG, MAX, MIN.

True
False

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

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

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Introduction to SQL
The SQL -92 wildcards are ____ and ____ .

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

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Introduction to SQL
Which of the following is a SQL aggregate function?

AVG
LEFT
JOIN
LEN

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Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

ROLLBACK
COMMIT
TRUNCATE
DELETE

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Introduction to SQL
What is the meaning of LIKE '%0%0%'

Feature has more than two 0's
Feature has two 0's in it, at any position
Feature begins with two 0's
Feature ends with two 0's

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