In response to Anton Gavazuk :
> Hi Andreas,
>
> great thanks for the response,
please, answer to the list, not to me, okay?
>
> unfortunately function just tests every row - it doesnt construct set of
> periods which would cover choosed period.
That's hard to achieve ... maybe you have to create a table with
contiguous periods. Somewhere i have found this code-snippet:
test=*# select * from t1;a
---- 1 2 3 4 6 7 810111213
(11 rows)
test=*# WITH RECURSIVE RecCols (LeftBoundary, Value) AS (SELECT a, a FROM t1 WHERE (a - 1) NOT IN (SELECT a FROM t1)
UNIONALL SELECT p.LeftBoundary, c.a FROM RecCols AS p, t1 AS c WHERE c.a = p.Value + 1) SELECT LeftBoundary, MAX(Value)
ASRightBoundary FROM RecCols GROUP BY LeftBoundary ORDER BY LeftBoundary;leftboundary | rightboundary
--------------+--------------- 1 | 4 6 | 8 10 | 13
(3 rows)
Maybe that's the way you have to go ...
Andreas
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Andreas Kretschmer
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