sql - Update top N rows with N specific for each row from other table -

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I would like to display the update front row of some external table with its external update specific values ​​and update it on top Forcing (n) using the lines, use the line from the external table, CountToUpdate

Update Top (q.CountToUpdate) dbo.TableName SET SomeId = NULL FROM @Quantities q where TableName.Status = 960 and TableName.SomeId = q.SomeId;

Is it possible to update this way or should I re-write it in something else?

DB on SBL Server 2012, thanks

I call it row_number ( ) and joining : 

  update from SETNIFIER = NULL (SELECT t. *, ROW_NUMBER () on (t. By SEIID order by T. SIID) SEQNUM FROM dbo.TableName t WHERE t.Status = 960) T zone @ probabilities q qomeome = ie.SomeId;

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