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Introduction to SQL

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

bc
gh
23
ab

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Introduction to SQL
Which of the following is valid SQL for an Index?

CHANGE INDEX ID;
CREATE INDEX ID;
ADD INDEX ID;
REMOVE INDEX ID;

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Introduction to SQL
Which of the following are the five built-in functions provided by SQL?

SUM, AVG, MULT, DIV, MIN
COUNT, SUM, AVG, MAX, MIN
SUM, AVG, MIN, MAX, NAME
SUM, AVG, MIN, MAX, MULT

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Introduction to SQL
A subquery in an SQL SELECT statement:

cannot have its results sorted using ORDER BY.
has a distinct form that cannot be duplicated by a join.
can only be used with two tables.
can always be duplicated by a join.

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Introduction to SQL
Which SQL statement is used to delete data FROM a database?

DELETE
COLLAPSE
ALTER
REMOVE

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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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