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Introduction to SQL

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

prints 045.926
prints 50
is illegal
prints garbage

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Introduction to SQL
How to select all data from student table starting the name from letter 'r'?

SELECT * FROM student WHERE name LIKE '_r%';
SELECT * FROM student WHERE name LIKE '%r%';
SELECT * FROM student WHERE name LIKE '%r';
SELECT * FROM student WHERE name LIKE 'r%';

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Introduction to SQL
When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

IN only.
NOT IN only.
Both IN and NOT IN.
LIKE only.

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Introduction to SQL
The format SELECT-FROM-WHERE is the fundamental framework of SQL SELECT statements.

True
False

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Introduction to SQL
What operator tests column for the absence of data?

None of these
EXISTS operator
NOT operator
IS NULL operator

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Introduction to SQL
To sort the results of a query use:

GROUP BY.
None of these
SORT BY.
ORDER BY.

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