Updating multiple columns

06-Dec-2019 10:22 by 9 Comments

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The general form of the nearest neighbor query is: “”; this is the query pattern used by location-aware applications to find POIs close to the user’s current location, for example.

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So my next step was to try to create a pure screen updating benchmark.Gurs has an interesting benchmark he has been running on various systems and Excel versions over the years.His results seem to show a massive performance decline in later Excel versions.Gurs does not want to speed up his benchmark because that would destroy his historic speed comparisons.But the problem is that a large portion of the time in his benchmark is taken by screen updating, and so his benchmark results vary significantly depending what part of the worksheet is actually visible on the screen, and hence how many visible cells get refreshed at each calculation.We’ll just add one to the Fish And Chips table, as follows: UPDATE s SET Closest Fishbar = f Name, Distance = Location.

STDistance(f Location) FROM ( SELECT Swimming Pools.*, fnc. Location AS f Location FROM Swimming Pools CROSS APPLY ( SELECT TOP 1 Name, Location FROM Fish And Chips WITH(index(sidx_Fish And Chips)) WHERE Fish And Chips.

With this in mind, I thought I’d demonstrate a practical scenario: let’s say you’re planning going for a swim at the local pool and, after you’ve swum 50 lengths, you’ll probably feel a bit peckish – perhaps in the need for some fish ‘n’ chips.

So, in this example I’m firstly going to import the Garmin POI data for swimming pools and fish ‘n’ chip shops in the UK, each being represented by a geography Point instance.

As you may have already noticed I prefer using apostrophes to double quotation marks as they make it possible to create more readable code.

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I’ll then add an extra column to the swimming pool table and populate it with the closest fish and chip shop to every swimming pool.