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Introduction to SQL

Introduction to SQL
SQL is a programming language.

True
False

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

True
False

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Introduction to SQL
Which of the following SQL commands can be used to add data to a database table?

ADD
INSERT
APPEND
UPDATE

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

2345
1234
456789
6789

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Introduction to SQL
The wildcard asterisk (*) is the SQL-92 standard for indicating "any sequence of characters."

True
False

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Introduction to SQL
There is an equivalent join expression that can be substituted for all subquery expressions.

True
False

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