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11.14.2007 at 07:47AM PST, ID: 22960212
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5.8

TOP vs MAX

Asked by dbaSQL in MS SQL Server

I need to get the TOP N number of records from this query.  but by TOP, i mean the greatest/highest values.  not just the TOP 10.  you know, the MAX.  if there are ten records in the result set, and i go in for the TOP 5, i want the highest 5 [O-A] and/or [X-C] values.

would anyone be able to help me w/this revision?

CREATE proc procname (
 @count int,
 @tsdate datetime=NULL
)
AS
SET NOCOUNT ON
SET ROWCOUNT @count


IF(@tsdate IS NULL)
BEGIN
  --if the parm is passed null, just get the max value (should use idx effectively)
  SELECT @tsdate = MAX(tsdate)FROM messagetable
  --remove the time portion
  SET @tsdate = CONVERT(DATETIME,CONVERT(VARCHAR(10),@tsdate,120),120)
END

SELECT t1.OrderNo,
  t2.timestampms - t1.timestampms AS [O-A],
  t3.timestampms - t4.timestampms AS [X-C]
FROM messagetable t1
LEFT JOIN messagetable t2 ON t1.orderno = t2.orderno and t2.Type = 'A'
LEFT JOIN messagetable t3 ON t1.orderno = t3.orderno and t3.Type = 'C'
LEFT JOIN messagetable t4 ON t1.orderno = t4.orderno and t4.Type = 'X'
WHERE t1.Type = 'O'
AND t1.tsdate >= @tsdate

SET ROWCOUNT 0

GO
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About this solution

Zone: MS SQL Server
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Solution Provided By: twoboats
Participating Experts: 3
Solution Grade: A
 
 
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