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Introduction to SQL

Introduction to SQL
Which of the following is a SQL aggregate function?

LEFT
JOIN
LEN
AVG

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Introduction to SQL
The keyword BETWEEN can be used in a WHERE clause to refer to a range of values.

True
False

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Introduction to SQL
The condition in a WHERE clause can refer to only one value.

True
False

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

SUM
COUNT
MAX
All of these

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Introduction to SQL
Microsoft Access has become ubiquitous, and being able to program in Access is a critical skill.

True
False

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Introduction to SQL
Which of the following is illegal?

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

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