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Introduction to SQL

Introduction to SQL
Most companies keep at least two versions of any database they are using.

True
False

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Introduction to SQL
The SQL keyword BETWEEN is used:

to limit the columns displayed.
None of these
as a wildcard.
for ranges.

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

ab
gh
23
bc

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Introduction to SQL
If you are going to use a combination of three or more AND and OR conditions, it is often easier to use the NOT and NOT IN operators.

False
True

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Introduction to SQL
Which of the following join is also called as an 'inner-join'?

Self-Join
None of these
Non-Equijoin
Equijoin

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

False
True

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