CompTIA ITF+ Practice Test

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Which relational database construct ensures valid values for a column?

Index
Join
Constraint
View

The correct answer is: Constraint

A) Indexes help speed up data retrieval but do not ensure validity. B) Joins allow for viewing and manipulation of data from different tables but do not ensure validity for a single column. C) Constraints are rules that ensure valid values for a column, such as a data type restriction or a minimum/maximum value. D) Views are virtual tables that display data from one or more tables but do not ensure validity for a single column.