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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?

APPEND
ADD
INSERT
UPDATE

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

EXISTS operator
IS NULL operator
NOT operator
None of these

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

23
gh
bc
ab

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Introduction to SQL
The SQL statement that queries or reads data from a table is ________ .

READ
None of these
SELECT
QUERY

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

False
True

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