What would the query "StreetName = 'Olive' AND SpeedLimit = 55 OR SpeedLimit = 55" select?

The query "StreetName = 'Olive' AND SpeedLimit = 55 OR SpeedLimit = 55" is structured in a way that it combines two conditions: the first condition specifies that the street name must be "Olive" and the speed limit must be 55 mph, while the second condition states that any segment with a speed limit of 55 mph satisfies the query.

When evaluating the query, the presence of the OR operator means that either of the conditions can be true for a road segment to be included in the results. This means that any road segment with a speed limit of 55 mph will be selected, regardless of its street name, in addition to any segments named "Olive" that have a speed limit of exactly 55 mph.

Therefore, the correct interpretation is that the query selects segments of the street named "Olive" that have a speed limit of 55 mph and includes all other road segments that also have a speed limit of 55 mph, regardless of their street name. This broad selection is facilitated by the use of the OR operator, which expands the result set.