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Introduction to SQL

Introduction to SQL
The rows of the result relation produced by a SELECT statement can be sorted, but only by one column.

True
False

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Introduction to SQL
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

True
False

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

COUNT
All of these
MAX
SUM

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Introduction to SQL
The result of a SQL SELECT statement is a ________ .

table
file
report
form

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Introduction to SQL
Which of the following SQL query is correct for selecting the name of staffs from 'staffinfo' table where salary is 10,000 or 25,000?

SELECT name FROM staffinfo WHERE salary BETWEEN 10000 AND 25000;
SELECT name FROM staffinfo WHERE salary IN (10000, 25000);
Both A and B
None of these

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Introduction to SQL
Which operator performs pattern matching?

LIKE operator
BETWEEN operator
EXISTS operator
None of these

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