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Introduction to SQL

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

HTML
DDL
DML
XML

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Introduction to SQL
Which of the following SQL query is correct for selecting the name of staffs from 'staffinfo' table where salary is 10,000 or 25,000?

None of these
Both A and B
SELECT name FROM staffinfo WHERE salary BETWEEN 10000 AND 25000;
SELECT name FROM staffinfo WHERE salary IN (10000, 25000);

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Introduction to SQL
SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions.

True
False

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Introduction to SQL
The command to eliminate a table from a database is:

REMOVE TABLE CUSTOMER;
DELETE TABLE CUSTOMER;
DROP TABLE CUSTOMER;
UPDATE TABLE CUSTOMER;

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

DELETE
COMMIT
ROLLBACK
TRUNCATE

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Introduction to SQL
The SELECT statement SELECT 'Hi' FROM DUAL WHERE NULL = NULL; Outputs

TRUE
FLASE
Nothing
Hi

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