Can i delete redundancy rows in geometry column?
i had more geom data rows in table . it's repeat,repeat and repeat .
but i want keep single row for twinssssssss
the "distinct" and "group by" function can't help me...
please take a idea for me ?
Hi,
for that case i would use SDO_AGGR_CENTROID or SDO_AGGR_UNION .
I had a similar problem where i had to determine, if geometries are redundant. I used here SDO_AGGR_UNION and then SDO_AGGR_CENTROID because i was not interested in one single point. Another way could be the use of SDO_WITHIN_DISTANCE or my favourite for searching duplicate geometries:
a selfjoin:
SELECT /*+ ORDERED */
b.<ID>, a.<ID>
FROM table_1 a, table_1 b
WHERE SDO_RELATE (a.<geometry>, b.<geometry>,
'mask=EQUAL querytype=WINDOW') = 'TRUE'
AND a.<ID> != b.<ID>;
regards, Andreas
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