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Introduction to SQL

Introduction to SQL
DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.

True
False

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

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

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Introduction to SQL
The command to eliminate a table from a database is:

DELETE TABLE CUSTOMER;
DROP TABLE CUSTOMER;
UPDATE TABLE CUSTOMER;
REMOVE TABLE CUSTOMER;

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

False
True

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Introduction to SQL
The condition in a WHERE clause can refer to only one value.

False
True

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