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Introduction to SQL

Introduction to SQL
The result of every SQL query is a table.

True
False

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Introduction to SQL
The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows.

False
True

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Introduction to SQL
Indexes can usually be created for both primary and secondary keys.

False
True

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

1234
6789
2345
456789

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Introduction to SQL
To establish a range of values, < and > can be used.

False
True

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Introduction to SQL
Count function in SQL returns the number of

columns.
values.
groups.
distinct values.

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