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Introduction to SQL

Introduction to SQL
The SQL statementSELECT ROUND(45.926, -1) FROM DUAL;

prints 045.926
prints garbage
prints 50
is illegal

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

DELETE
ROLLBACK
TRUNCATE
COMMIT

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

DELETE
ROLLBACK
COMMIT
TRUNCATE

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Introduction to SQL
Count function in SQL returns the number of

columns.
values.
distinct values.
groups.

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Introduction to SQL
Find all the cities whose humidity is 89

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

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Introduction to SQL
SQL data definition commands make up a(n) ________ .

DML
XML
HTML
DDL

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