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Introduction to SQL

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

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

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Introduction to SQL
Which of the following group functions ignore NULL values?

MAX
All of these
COUNT
SUM

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Introduction to SQL
Count function in SQL returns the number of

values.
distinct values.
columns.
groups.

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Introduction to SQL
Which of the following is illegal?

None of these
SELECT SYSDATE - (SYSDATE - 2) FROM DUAL;
SELECT SYSDATE - SYSDATE FROM DUAL;
SELECT SYSDATE - (SYSDATE + 2) FROM DUAL;

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Introduction to SQL
What operator tests column for the absence of data?

None of these
EXISTS operator
NOT operator
IS NULL operator

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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
None of these
more than 10 rows
less than 10 rows

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