March 2015 - users-list

[MonetDB-users] Books CDs
by CHARTS LICENSING 11 Aug '24

11 Aug '24

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Multi-column update based on joined table
by Lee Hachadoorian 11 Aug '24

11 Aug '24

I need to update multiple columns (~250) from one table to another based on a two-column key. In Postgres I would write this using the FROM clause, but since MonetDB doesn't support the FROM clause, I've successfully updated one column with: UPDATE census.acs2010_5yr SET b07401001 = ( SELECT CAST(b07401001 AS int) FROM acs2010_5yr.tmp_seq0001 WHERE acs2010_5yr.stusab = tmp_seq0001.stusab AND acs2010_5yr.logrecno = tmp_seq0001.logrecno ); My question is whether there is any benefit to writing a multiple column update into a single UPDATE statement: UPDATE target_table SET column1 = (SELECT column1 FROM source_table WHERE target_table.key = source_table.key), column2 = (SELECT column2 FROM source_table WHERE target_table.key = source_table.key), ..., columnN = (SELECT columnN FROM source_table WHERE target_table.key = source_table.key); On Postgres I believe the multi-column update using a table join would only have to do the sequential scan of each table once, but with the necessity of sub-selects in MonetDB, what is the backend doing? Is it already doing an index scan once for each row in the single column case, then doing it once for each row * column in the multi-column case? Best, --Lee -- Lee Hachadoorian Asst Professor of Geography, Dartmouth College http://freecity.commons.gc.cuny.edu/

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[MonetDB-users] XQuery API and XLink/XUpdate support
by Alexandra Mart�nez 27 Jun '24

27 Jun '24

Hello all, I was wondering if there is any documentation about the API for XQuery (i.e., how to write xqueries from a Java program). Also, I am interested in using some features of XLink and XUpdate on top of my XML database. Is support for any of these in progress? Thanks in advance, Alexandra ______________________________________________________ Click here to donate to the Hurricane Katrina relief effort. http://store.yahoo.com/redcross-donate3/

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[MonetDB-users] Proofreading your professional documents
by Richard Hounslow 24 Feb '24

24 Feb '24

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Creating an AWS AMI
by Maarten Sander 22 Apr '15

22 Apr '15

Hi everyone, Is there an easy way to create an AWS AMI running MonetDB? Perhaps someone maintains a Packer template? Regards, Maarten

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C++ user defined function
by Jiří Nádvorník 01 Apr '15

01 Apr '15

Hi, I'm trying to write a function in C++ and I thought I would just provide a makefile for it in my custom folder in MonetDB/sql/backends/monet5/CUSTOM. But it seems like all of the Makefiles in UDF sample are generated by the bootstrap. How do I get over this? I need to use external C++ libraries in the makefile.. Thank you for help. Best regards, Jiri Nadvornik Astronomical Institute AV CR Stellar department Czech Republic <mailto:nadvornik.ji@gmail.com> nadvornik.ji(a)gmail.com

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Mal description for a BAT function
by Jiří Nádvorník 31 Mar '15

31 Mar '15

Hi, I'm sorry for spamming so much, but I have to get more into the idea of BATs before I will be a little more self-sufficient. I need a function which takes two table columns as parameters. I would come up with this MAL declaration: command build_chunks(ra:bat[:oid,:dbl], dec:bat[:oid,:dbl], nside_low:int, nside_high:int):bat[:oid,:oid] address OSPSbuild_chunks comment "Build HEALPix groups for further processing."; It should take ra, dec parameters (from my DB table) and then some integer parameters. I guess it should return an oid, because all it does is that it should write some computed result (multiple rows) to another table. I have still no idea how I will do that, but I feel I'm getting closer J. The function produces a c++ vector of some integers, which I want to write down to another table. Is that MAL declaration looking correct? How should I call that function? I understand that SELECT reverse('hello'), but I don't know when the parameter is passed from a query. Thank you very much for pointing me in the right direction. Best regards, Jiri Nadvornik Astronomical Institute AV CR Stellar department Czech Republic <mailto:nadvornik.ji@gmail.com> nadvornik.ji(a)gmail.com

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UDF function example
by Jiří Nádvorník 31 Mar '15

31 Mar '15

Hi, When I download the source code from mercurial and run: 1. bootstrap, configure, make, make install 2. monetdbd start myFarm, mclient demo 3. sql>select 'hello',reverse('hello'); The output is: SELECT: no such unary operator 'reverse(char)' What can be wrong here? I had the original installation from packages, then I apt-get removed them and installed via the make install. Any ideas appreciated. Best regards, Jiri Nadvornik Astronomical Institute AV CR Stellar department Czech Republic <mailto:nadvornik.ji@gmail.com> nadvornik.ji(a)gmail.com

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Table partitioning over nodes
by Jiří Nádvorník 31 Mar '15

31 Mar '15

Hi All, I have one table with data that can be grouped easily. I need to iterate over these groups, count their members and distribute them uniformly over the database nodes (physically). If I have three groups A, B, C of size (1, 1, 2) and two physical nodes - I want A,B to be on node no. 1 and C on the node no. 2. The question is quite simple. Is it possible? Jiri Nadvornik Astronomical Institute AV CR Stellar department Czech Republic <mailto:nadvornik.ji@gmail.com> nadvornik.ji(a)gmail.com

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COPY INTO FROM STDIN and auto increment column
by fadila.mumbasic＠uniserv.com 30 Mar '15

30 Mar '15

Hi, We are facing problems with COPY INTO .. FROM STDIN and an auto increment column, which is the primary key column in the table. The client is our own java client. If we don't set any value for this column (which is our expected constellation) there is neither error nor exception, but no record is inserted into the table. A try with a null value for this column produces the same result (no exception, no record in the table) The only way to insert records is to set the proper value for the column, but it is not the supposed behavior of an auto increment column, isn't it? Best regards, Fadila

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