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Introduction to SQL

Introduction to SQL
COUNT(field_name) tallies only those rows that contain a value; it ignores all null values.

True
False

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Introduction to SQL
Which of the following SQL commands can be used to add data to a database table?

APPEND
UPDATE
INSERT
ADD

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Introduction to SQL
Table employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM employee WHERE SALARY > ALL (SELECT SALARY FROM EMPLOYEE);prints

10
5
0
9

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Introduction to SQL
The qualifier DISTINCT must be used in an SQL statement when we want to eliminate duplicate rows.

False
True

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Introduction to SQL
The benefits of a standard relational language include which of the following?

All of these
Applications are not needed
Increased dependence on a single vendor
Reduced training costs

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Introduction to SQL
To sort the results of a query use:

ORDER BY.
SORT BY.
None of these
GROUP BY.

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