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Introduction to SQL

Introduction to SQL
Count function in SQL returns the number of

columns.
values.
distinct values.
groups.

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Introduction to SQL
You can add a row using SQL in a database with which of the following?

INSERT
MAKE
ADD
CREATE

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

All of these
COUNT
MAX
SUM

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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 > ANY (SELECT SALARY FROM EMPLOYEE);prints

10
5
0
9

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Introduction to SQL
Which of the following is a valid SQL type?

FLOAT
CHARACTER
NUMERIC
All of these

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Introduction to SQL
A subquery in an SQL SELECT statement:

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

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