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Introduction to SQL

Introduction to SQL
SQL provides five built-in functions: COUNT, SUM, AVG, MAX, MIN.

False
True

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

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

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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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Introduction to SQL
Which of the following do you need to consider when you make a table in SQL?

Primary keys
All of these
Default values
Data types

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Introduction to SQL
Which of the following must be enclosed in double quotes?

Strings
Column Alias
All of these
Dates

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Introduction to SQL
A subquery in an SQL SELECT statement:

cannot have its results sorted using ORDER BY.
can always be duplicated by a join.
has a distinct form that cannot be duplicated by a join.
can only be used with two tables.

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