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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?

CHANGE TABLE
ALTER TABLE
MODIFY TABLE
All of these

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Introduction to SQL
Let the statementSELECT column1 FROM myTable;return 10 rows. The statementSELECT ALL column1 FROM myTable;will return

more than 10 rows
less than 10 rows
None of these
exactly 10 rows

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Introduction to SQL
Indexes may be created or dropped at any time.

True
False

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

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

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Introduction to SQL
To remove duplicate rows from the results of an SQL SELECT statement, the ________ qualifier specified must be included.

DISTINCT
UNIQUE
SINGLE
ONLY

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Introduction to SQL
The SQL statementSELECT SUBSTR('abcdefghij', INSTR('123321234', '2', 3, 2), 2) FROM DUAL;prints

bc
gh
23
ab

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