Test whether the object is Assigned() which means... not null

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  ---------- ----------- ----- ------- ----------

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  ---------- ----------- ----- ------- ----------

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  X 15/01/2015 7 7.00 4

  X 15/01/2015 8 4

  X 15/01/2015 9 4

  X 15/01/2015 10 4

  X 15/01/2015 11 4

  X 15/01/2015 12 4

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  concerning

  Neil

  Hello

  Here's one way:

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  (

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  ORDER BY col_b, col_c

  LINES BETWEEN 5 PRECEDING

  AND 1 PRECEDING

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  OF sample_table t

  )

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  ORDER BY col_b, col_c

  ) AS myavg

  OF got_avg

  ORDER BY col_a, col_b, col_c

  ;

  Too bad, that we cannot use the IGNORE NULLS with AVG function.

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  .
  .
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