Re: Check set of date intervals

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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