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Introduction to SQL

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

INSERT
UPDATE
APPEND
ADD

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Introduction to SQL
DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.

True
False

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Introduction to SQL
The SQL statementSELECT SUBSTR('abcdefghij', INSTR('123321234', '2', 3, 2), 2) FROM DUAL;prints

23
bc
gh
ab

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Introduction to SQL
SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions.

True
False

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Introduction to SQL
Which of the following is a SQL aggregate function?

LEN
AVG
LEFT
JOIN

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

True
False

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