Technical Article

Decimal to Binary Conversion for event scheduling

This procedure was written to create an event schedule     where the schedule may have non-consecutive days.    The input for the procedure is START DATE, END DATE, and DAYMAP    The DAYMAP input parameter is a decimal number whose binary representation    describes the schedule days over potentially a 4 week period (read from right to left).    […]

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2002-04-17

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Question of the Day

The LAGging NULL

I have this data in a SQL Server 2022 table:

player         yearid team HR
Alex Rodriguez 2012   NYY  18
Alex Rodriguez 2013   NYY  7
Alex Rodriguez 2014   NYY  NULL
Alex Rodriguez 2015   NYY  12
Alex Rodriguez 2016   NYY  9
If I run this code, what are the results returned in the hrgrowth column?
SELECT
  player
, yearid
, hr
, hr - LAG (hr, 1, 0) IGNORE NULLS OVER (ORDER BY yearid) AS hrgrowth
FROM dbo.playerstats;

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