[SQL] How to realize ROW_NUMBER() in 8.3?
Hello, ROW_NUMBER() is only ready in 8.4. For 8.3, is there a simple way to get row_number select row_number(), col1, col2... FROM tableName Thanks a lot! Ding Ye -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] How to realize ROW_NUMBER() in 8.3?
On Apr 20, 2011, at 9:15 PM, Emi Lu wrote: > ROW_NUMBER() is only ready in 8.4. For 8.3, is there a simple way to get > row_number > select row_number(), col1, col2... > FROM tableName Following is a link of deepsz which has a way of implementation of rownum. http://www.depesz.com/index.php/2007/08/17/rownum-anyone-cumulative-sum-in-one-query/ Thanks & Regards, Vibhor Kumar EnterpriseDB Corporation The Enterprise PostgreSQL Company vibhor.ku...@enterprisedb.com Blog:http://vibhork.blogspot.com -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] How to realize ROW_NUMBER() in 8.3?
If your table is not terribly big, you can try something like SELECT a.col1,a.col2, COUNT(*) as row_number FROM yourTable a,yourTable b WHERE a.col1 >= b.col1 -- I'm assuming col1 is primary key GROUP BY a.col1,a.col2 ORDER BY row_number This is pure SQL, should work in every version... Best, Oliveiros - Original Message - From: "Emi Lu" To: Sent: Wednesday, April 20, 2011 4:45 PM Subject: [SQL] How to realize ROW_NUMBER() in 8.3? Hello, ROW_NUMBER() is only ready in 8.4. For 8.3, is there a simple way to get row_number select row_number(), col1, col2... FROM tableName Thanks a lot! Ding Ye -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
[SQL]
I am running into a behavior with a postgresql function with a SETOF
refcursor's returning multiple columns. Not sure if there is a different way to
retrieve a SETOF refcursor's with variable columns? Alternatively can I return
a primitive value and a refcursor from the same function. I tried specifying
this as OUT parameters without any luck. In Oracle you can pass this in
functions:
Platform:postgresql-x64-9.0 (PostgreSQL 9.0.1, compiled by Visual C++ build
1500, 64-bit)Java1.6JDBC4 Postgresql Driver, Version 9.0-801
Function:CREATE OR REPLACE FUNCTION test() RETURNS SETOF refcursor
AS$BODY$DECLAREref1 refcursor;ref2 refcursor;BEGIN OPEN ref1 FOR
SELECT 1; RETURN NEXT ref1; OPEN ref2 FOR SELECT 2, 3;
RETURN NEXT ref2; RETURN;END;$BODY$ LANGUAGE plpgsql
Java Code:CallableStatement cs = conn.prepareCall("{ call test() }");ResultSet
rs = cs.executeQuery();
while (rs.next()) { System.out.println(rs.getString(1));ResultSet rs2 =
(ResultSet)rs.getObject(1); while (rs2.next()) {
ResultSetMetaData rsmd = rs2.getMetaData(); int numberOfColumns =
rsmd.getColumnCount();System.out.println("numberOfColumns: " +
numberOfColumns); System.out.println(rs2.getString(1));
System.out.println(rs2.getString(2)); }}
Output:numberOfColumns: 11org.postgresql.util.PSQLException:
The column index is out of range: 2, number of columns: 1.at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkColumnIndex(AbstractJdbc2ResultSet.java:2680)
at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkResultSet(AbstractJdbc2ResultSet.java:2697)
at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.getString(AbstractJdbc2ResultSet.java:1872)
at PgBlob.test(PgBlob.java:64)at PgBlob.main(PgBlob.java:37)
It appears the second result-set takes in the number of columns from the first
irrespective of the number of columns from the second. If the change the
function to return 2 refcursor's with same number of columns then it works as
expected.
Function:CREATE OR REPLACE FUNCTION test() RETURNS SETOF refcursor
AS$BODY$DECLAREref1 refcursor;ref2 refcursor;BEGIN OPEN ref1 FOR
SELECT 1, null; RETURN NEXT ref1; OPEN ref2 FOR SELECT 2, 3;
RETURN NEXT ref2; RETURN;END;$BODY$ LANGUAGE plpgsql
Output:numberOfColumns: 214numberOfColumns:
223
[SQL] help on select
Hi guys, I need your help. I have a table called medidas, in this table i have some ocurrences that has id_medida(primary key) id_ponto (sec_key) and also datetime field as timestamp. i would like to know from a set of idpontos, e.g. 10,11,23,24 how can i get the most recent date that is common to all?? for example, if idponto das date 2011-02-03 but none of others have this date in the db i dont want this. i want one common for all.. thanks. *--- **Saulo B. M. Venâncio* Control and Automation Eng. Student *Associate in Business Management* T +55 4884121486 *E saulo.venan...@gmail.com *
