September 2014 - 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

Dear Professor/Lecturer Please excuse us for contacting you directly. We are offering an efficient service to help you ensure your academic and professional work is written in perfect English. We will check the grammar and style of your work and return it to you to meet your requirements and deadlines. Proof-Reading-Service.com can provide you with a professional proofreading service at a very reasonable rate. All our proofreaders are highly qualified native English speakers. Many work as leading academics in their fields and all have extensive experience of proofreading to the highest standards. If you are interested in our service, please take a look at our website: www.proof-reading-service.com All you have to do is send us your document as a word attachment with the deadline and we will guarantee delivery of a perfectly written document to give you complete confidence when you submit your work. The fee is worked out on a flat rate (£6.95 per thousand words or 0.695 pence per word), so you know exactly how much the proofreading will cost in advance. Once we have received your document(s) we will confirm the word count, the price and the deadline. If you have not heard from us within 2 hours during normal business hours after you have sent your work please resend it from a different email account or send the file to proofreadings(a)gmail.com. We look forward to hearing from you! Yours faithfully Proof-Reading-Service.com

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Can not drop the view
by Radovan Bičiště 06 Oct '14

06 Oct '14

Hello, I'm wondering if there is some hard core way to drop a view. Somehow I have three views that I'm not able to drop. I can issue drop statement several times and it returns success. Here is log from mclient: ceos@lux-drmax-ana:/u01/ceosdata/database/monetdb/drmax/crm$ mclient -d zkdev1 -u drmaxtst password: Welcome to mclient, the MonetDB/SQL interactive terminal (Jan2014-SP2) Database: MonetDB v11.17.17 (Jan2014-SP2), 'mapi:monetdb://lux-drmax-ana:50000/zkdev1' Type \q to quit, \? for a list of available commands auto commit mode: on sql>\dv VIEW drmaxtst.all_constraints VIEW drmaxtst.all_tab_columns VIEW drmaxtst.mmtest_v VIEW drmaxtst.pohyby_prodeje_v VIEW drmaxtst.prijmy_2012_v_mr_tmp VIEW drmaxtst.prijmy_v VIEW drmaxtst.prodeje_2011_v VIEW drmaxtst.prodeje_2012_v VIEW drmaxtst.prodeje_2012_v_mr_tmp VIEW drmaxtst.prodeje_2013_v VIEW drmaxtst.prodeje_2014_v VIEW drmaxtst.prodeje_v VIEW drmaxtst.stav_skladu_historie sql>drop view drmaxtst.prodeje_v; operation successful (3.168ms) sql>drop view drmaxtst.prodeje_v; operation successful (3.004ms) sql>drop view drmaxtst.prodeje_v; operation successful (7.501ms) sql>drop view drmaxtst.prodeje_v; operation successful (4.154ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.351ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.410ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.355ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.685ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.646ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.695ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.390ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.399ms) sql>drop view drmaxtst.prodeje_v; DROP VIEW: unknown view 'prodeje_v' sql>drop view drmaxtst.prodeje_v; DROP VIEW: unknown view 'prodeje_v' sql>\dv VIEW drmaxtst.all_constraints VIEW drmaxtst.all_tab_columns VIEW drmaxtst.mmtest_v VIEW drmaxtst.pohyby_prodeje_v VIEW drmaxtst.prijmy_2012_v_mr_tmp VIEW drmaxtst.prijmy_v VIEW drmaxtst.prodeje_2011_v VIEW drmaxtst.prodeje_2012_v VIEW drmaxtst.prodeje_2012_v_mr_tmp VIEW drmaxtst.prodeje_2013_v VIEW drmaxtst.prodeje_2014_v VIEW drmaxtst.prodeje_v VIEW drmaxtst.stav_skladu_historie sql> I guess my only option is to dump a reload the database. :( Radovan

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why is my SAMPLE percentage limiter throwing an error?
by Anthony Damico 30 Sep '14

30 Sep '14

sorry if this is a silly question.. i'm trying to sample a percentage of a table. from https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/Sampling it looks like these should work, but i must be making a mistake in my syntax somewhere? thanks!! create table test ( a int , b double precision ); insert into test values( 1 , 3.3 ); insert into test values( 13 , 2.3 ); insert into test values( 3 , 0.3 ); select * from test sample 0.1 ; TypeException:user.s12_1[9]:'sample.subuniform' undefined in: _18:any := sample. subuniform(_15:bat[:oid,:int], _16:dbl) program contains errors select * from test uniform sample 0.1 ; TypeException:user.s13_1[9]:'sample.subuniform' undefined in: _18:any := sample. subuniform(_15:bat[:oid,:int], _16:dbl) program contains errors # MonetDB 5 server v11.17.21 "Jan2014-SP3" # Serving database 'demo', using 8 threads # Compiled for x86_64-pc-winnt/64bit with 64bit OIDs dynamically linked # Found 7.860 GiB available main-memory. # Copyright (c) 1993-July 2008 CWI. # Copyright (c) August 2008-2014 MonetDB B.V., all rights reserved # Visit http://www.monetdb.org/ for further information # Listening for connection requests on mapi:monetdb://127.0.0.1:50000/ # MonetDB/JAQL module loaded # MonetDB/SQL module loaded >

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MEDIAN ???
by Budulinku Dejmihrasku 26 Sep '14

26 Sep '14

Hi, just a quick question regarding to MEDIAN: with x as (select 1.0 as a union all select 2.0 as a) select sys.median(a) as result from x returns result=1 i would expect result=1.5 though any suggestion? thanks milan

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Show create table equivalent
by Guillaume Bassot 23 Sep '14

23 Sep '14

Hello everyone, I'm looking for the mysql show create table equivalent. I need this as a query to get the result in a php script. (I already found how to do this with mclient and msqldumq) I found this query that need to be parsed to recreate the "CREATE TABLE". SELECT * FROM SYS.tables tbl INNER JOIN SYS.columns col ON (tbl.id=col.table_id) WHERE tbl.name='exemple'; But i still miss the table's constraints (primary key, unique key) Could you tell me where to find this information ? Thank you for helping. Guillaume BASSOT Web Developer +33 (0)1 55 48 02 82 gbassot(a)inbox.fr 30, rue Vincent Moris 92240 Malakoff - France Fax : +33 (0)1 55 48 02 79

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table size
by Christian Braun 22 Sep '14

22 Sep '14

Hello, i want to know how much disk space each table uses. How can i find out to which table each of the files in the database directory belong? Thanks in advance, Christian

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Crashing when querying on date column
by Nick Chadwick 18 Sep '14

18 Sep '14

Hi. I'm currently evaluating MonetDB for an upcoming project, and am having some problems when using date criteria in the where clause. I have a very simple table: Create table negs (id varchar(50) not null, xdate date not null, market int, product int, notional double) Id and xdate form a composite primary key, and I have indices on xdate, market and product. If I run the following query: Select * from negs where xdate = current_date the client crashes. Similarly if I run the same query over a JDBC connection from java, the connection is lost. Looking in the log file, it says that the database was killed due to a SIGSEGV. Am I doing something wrong? I am running on Ubuntu 14.04, and built MonetDB from the latest source tarball, 11.17.21. Thanks, Nick www.digiterre.com _________________ Privileged or confidential information may be contained in this message. If you are not the addressee of this message please notify the sender by return and thereafter delete the message, and you may not use, copy, disclose or rely on the information contained in it. Internet e-mail may be susceptible to data corruption, interception and unauthorised amendment for which Digiterre does not accept liability. Whilst we have taken reasonable precautions to ensure that this e-mail and any attachments have been swept for viruses, Digiterre does not accept liability for any damage sustained as a result of viruses. Statements in this message that do not relate to the business of Digiterre are neither given nor endorsed by the company or its directors.

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