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Introduction to SQL

Introduction to SQL
Most companies keep at least two versions of any database they are using.

False
True

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

NOT operator
EXISTS operator
None of these
IS NULL operator

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Introduction to SQL
The SQL statement: SELECT Number1 + Number 2 AS Total FROM NUMBER_TABLE; adds two numbers from each row together and lists the results in a column named Total.

False
True

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Introduction to SQL
The SQL WHERE clause:

limits the column data that are returned.
Neither A nor B are correct.
Both A and B are correct.
limits the row data are returned.

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

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Introduction to SQL
If you are going to use a combination of three or more AND and OR conditions, it is often easier to use the NOT and NOT IN operators.

False
True

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