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Introduction to SQL

Introduction to SQL
The SQL statementSELECT ROUND(45.926, -1) FROM DUAL;

prints 045.926
prints 50
prints garbage
is illegal

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Introduction to SQL
Which of the following is the correct order of keywords for SQL SELECT statements?

WHERE, FROM,SELECT
FROM, WHERE, SELECT
SELECT,WHERE,FROM
SELECT, FROM, WHERE

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Introduction to SQL
The SQL WHERE clause:

Both A and B are correct.
Neither A nor B are correct.
limits the row data are returned.
limits the column data that are returned.

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Introduction to SQL
'AS' clause is used in SQL for

Join operation.
Projection operation.
Rename operation.
Selection operation.

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Introduction to SQL
A subquery in an SQL SELECT statement:

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

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

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

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