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Introduction to SQL

Introduction to SQL
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

True
False

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Introduction to SQL
The SQL statementSELECT SUBSTR('123456789', INSTR('abcabcabc', 'b'), 4) FROM DUAL;

2345
6789
456789
1234

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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
Find all the cities whose humidity is 89

SELECT city FROM weather WHERE humidity = 89;
SELECT city FROM weather;
SELECT humidity = 89 FROM weather;
SELECT city WHERE humidity = 89;

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Introduction to SQL
What is the meaning of LIKE '%0%0%'

Feature has two 0's in it, at any position
Feature begins with two 0's
Feature ends with two 0's
Feature has more than two 0's

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

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

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