sql server 2005 - SQL - When would an empty OVER clause be used? -

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I am analyzing some code which uses the empty over clause in the calculation () competition.

Example: 

  SELECT ROW_NUMBER () over (priority order by DESC) AS Rovid, CAST ((COUNT (*) Over () / @ POSISES) AS TOTAL PAGE ,

I am trying to understand why the empty open clause is being used.

There are other standard selection elements below the two rows listed below , And when I leave the blank on the other side, from the total page line, I get errors like this: 

  column 'table. Priority' The selection is invalid in the list because it is not contained in any one function or group by section

as soon as I put it back (), the error is exhausted.

My understanding of the over clause is very limited ... I feel as if I understand what's going on in the RUID LINE ... but the total page line is just me quiet.

< P>

over () is part of analytical work and with your records In defines the division. Over () is only one partition and applies to the entire dataset

i.e. COUNT (*) over () will return to each line, how many records will be in your dataset.

See this


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