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Introduction to SQL

Introduction to SQL
Which SQL statement is used to update data in a database?

UPDATE
SAVE
MODIFY
SAVE AS

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Introduction to SQL
Find all the cities whose humidity is 89

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

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Introduction to SQL
A SELECT statement within another SELECT statement and enclosed in square brackets ([...]) is called a subquery.

False
True

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Introduction to SQL
SQL is:

a data sublanguage.
a DBMS.
an operating system.
a programming language.

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Introduction to SQL
The command to remove rows from a table 'CUSTOMER' is:

REMOVE FROM CUSTOMER ...
DROP FROM CUSTOMER ...
UPDATE FROM CUSTOMER ...
DELETE FROM CUSTOMER WHERE ...

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Introduction to SQL
Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.

True
False

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