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Choose the best response for each of the questions below.
Which one of the following statements is a characteristic of a relational database?
All columns in a table must be of the same data type.
A row in a table represents a single instance of an entity.
Rows in the same table can contain different columns.
Which SQL statement is used to query tables and return data?
QUERY
READ
SELECT
What is an index?
A structure that enables queries to locate rows in a table quickly
A virtual table based on the results of a query
A predefined SQL statement that modifies data
You must answer all questions before checking your work.
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