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Introduction to SQL

Introduction to SQL
Which SQL keyword is used to retrieve a maximum value?

MAX
TOP
MOST
UPPER

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Introduction to SQL
DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.

False
True

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Introduction to SQL
A subquery in an SQL SELECT statement is enclosed in:

CAPITAL LETTERS.
brackets -- [...].
braces -- {...}.
parenthesis -- (...) .

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Introduction to SQL
The SQL statementSELECT SUBSTR('abcdefghij', INSTR('123321234', '2', 3, 2), 2) FROM DUAL;prints

ab
gh
bc
23

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Introduction to SQL
ON UPDATE CASCADE ensures which of the following?

Data Integrity
All of these
Normalization
Materialized Views

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Introduction to SQL
A subquery in an SQL SELECT statement:

can only be used with two tables.
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.

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