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Introduction to SQL

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

Dates
Strings
Column Alias
All of these

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Introduction to SQL
'AS' clause is used in SQL for

Join operation.
Rename operation.
Selection operation.
Projection operation.

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Introduction to SQL
A subquery in an SQL SELECT statement:

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

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Introduction to SQL
SQL is a programming language.

False
True

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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?

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

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Introduction to SQL
SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions.

True
False

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