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Introduction to SQL

Introduction to SQL
In SQL, which command(s) is(are) used to change a table's storage characteristics?

ALTER TABLE
All of these
CHANGE TABLE
MODIFY TABLE

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

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

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

Data types
All of these
Default values
Primary keys

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Introduction to SQL
Table Employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM Employee WHERE SALARY > ANY (SELECT SALARY FROM EMPLOYEE);prints

5
0
9
10

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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
What operator tests column for the absence of data?

EXISTS operator
None of these
IS NULL operator
NOT operator

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