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Introduction to SQL

Introduction to SQL
COUNT(field_name) tallies only those rows that contain a value; it ignores all null values.

True
False

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Introduction to SQL
Which SQL keyword is used to retrieve only unique values?

DIFFERENT
DISTINCT
DISTINCTIVE
UNIQUE

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

prints 045.926
prints garbage
prints 50
is illegal

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

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

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

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

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Introduction to SQL
The SQL statementSELECT SUBSTR('123456789', INSTR('abcabcabc', 'b'), 4) FROM DUAL;

1234
456789
2345
6789

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