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Introduction to SQL

Introduction to SQL
Which of the following is valid SQL for an Index?

REMOVE INDEX ID;
CREATE INDEX ID;
ADD INDEX ID;
CHANGE INDEX ID;

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Introduction to SQL
Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.

False
True

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Introduction to SQL
The SQL statementSELECT SUBSTR('123456789', INSTR('abcabcabc', 'b'), 4) FROM DUAL;

456789
6789
2345
1234

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

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

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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
The ADD command is used to enter one row of data or to add multiple rows as a result of a query.

False
True

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