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Introduction to SQL

Introduction to SQL
Which SQL statement is used to delete data FROM a database?

DELETE
COLLAPSE
REMOVE
ALTER

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Introduction to SQL
Which of the following join is also called as an 'inner-join'?

Self-Join
None of these
Equijoin
Non-Equijoin

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

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

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Introduction to SQL
Which of the following group functions ignore NULL values?

COUNT
All of these
SUM
MAX

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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?

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

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Introduction to SQL
SQL is a data sublanguage.

False
True

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