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Introduction to SQL

Introduction to SQL
SQL is a programming language.

False
True

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

1234
2345
456789
6789

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Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

TRUNCATE
COMMIT
DELETE
ROLLBACK

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Introduction to SQL
Which of the following command makes the updates performed by the transaction permanent in the database?

TRUNCATE
COMMIT
ROLLBACK
DELETE

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Introduction to SQL
SUM, AVG, MIN, and MAX can only be used with numeric columns.

True
False

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Introduction to SQL
Find all the cities whose humidity is 89

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

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