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Introduction to SQL

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

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

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

bc
ab
23
gh

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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
Indexes can usually be created for both primary and secondary keys.

True
False

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Introduction to SQL
The keyword LIKE can be used in a WHERE clause to refer to a range of values.

True
False

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

All of these
MAX
COUNT
SUM

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