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Introduction to SQL

Introduction to SQL
'AS' clause is used in SQL for

Rename operation.
Projection operation.
Join operation.
Selection operation.

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Introduction to SQL
............. joins two or more tables based on a specified column value not equaling a specified column value in another table.

OUTER JOIN
EQUIJOIN
NON-EQUIJOIN
NATURAL JOIN

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

UPDATE
SAVE
SAVE AS
MODIFY

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

COMMIT
TRUNCATE
DELETE
ROLLBACK

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Introduction to SQL
Which of the following is illegal?

None of these
SELECT SYSDATE - (SYSDATE - 2) FROM DUAL;
SELECT SYSDATE - (SYSDATE + 2) FROM DUAL;
SELECT SYSDATE - SYSDATE FROM DUAL;

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Introduction to SQL
Let the statementSELECT column1 FROM myTable;return 10 rows. The statementSELECT ALL column1 FROM myTable;will return

exactly 10 rows
None of these
less than 10 rows
more than 10 rows

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