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7.6

SQL Query

Asked by davelane in Oracle Database

Couldn't find a forum just for SQL so I'll ask here as the DB I am using is Oracle.

OK. I have a fairly large table with say 5000 entries in the following form:

GISID DATATYPE TIMESTAMP ID VALUE
123 ABC 12:00 1 12345
123 ABC 12:05 2 23456
123 ABC 12:10 3 34567
123 XYZ 12:00 4 45678
123 XYZ 12:05 5 56789
999 ABC 12:00 6 67890
999 XYZ 12:05 7 78901
etc.

I want to do a single select that returns me the latest (i.e. with the newest timestamp) for each unique pair of GISID and DATATYPE. I.e. that would return

123 ABC 12:10 3 34567
123 XYZ 12:05 5 56789
999 ABC 12:00 6 67890
999 XYZ 12:05 7 78901

If I implement that programatically it leads to as many SQL queries as there are unique pairings of GISID and DATATYPE, which will be large. There are typically at most 3 values for a pairing at any given time in the table.

Something like
SELECT GISID, DATATYPE, Max(TIMESTAMP)
FROM TABLEX
GROUP BY GISID, DATATYPE

Will give me the 3 fields GISID, DATATYPE and TIMESTAMP, but I need all the data for a row.

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20091118-EE-VQP-93

SQL Query

Asked by davelane in Oracle Database

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