October 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

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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Find all running processes?
by Vijay Krishna 31 Mar '16

31 Mar '16

How to find all running processes and their statuses in MonetDB?? I found this... https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/monitor But I couldn't get this work... I ran a query (which took some 20 seconds to complete) in a window and connected the same database in another terminal and ran "select * from sys.queue" (several times during those 20 seconds) but I could get only this... sql>select * from sys.queue; +-------+---------+----------------------------+----------------------------+----------+---------+------------+--------------------------+ | qtag | user | started | estimate | progress | status | tag | query | +=======+=========+============================+============================+==========+=========+============+==========================+ | 27339 | monetdb | 2015-08-13 05:35:40.000000 | null | null | running | 12532134@0 | select * from sys.queue; | +-------+---------+----------------------------+----------------------------+----------+---------+------------+--------------------------+ I am using Oct-2014 version of monetdb on CentOS... Is there a way to find all running processes and their statuses in MonetDB?? Thanks & Regards, Vijayakrishna.P. Mobile : (+91) 9500402305.

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String functions support in MonetDB
by Sébastien RAILLARD (PASSMAN) 24 Nov '15

24 Nov '15

Dear all, Is there a way to concatenate more than 2 strings at once? The CONCAT function only allow for concatenating 2 strings. Also, hhe JDBC driver for MonetDB reports that the following string functions are supported (see the list below). Are these functions documented somewhere? ascii char_length character_length code concat copyfrom difference editdistance editdistance2 get_value_for ilike index insert lcase left length levenshtein like locate lower lpad ltrim next_value_for not_ilike not_like octet_length patindex qgramnormalize repeat replace restart right rpad rtrim similarity soundex space splitpart strings substring trim truncate ucase upper Best regards, Sebastien -- Parc d'activité Tolstoï 4 rue Edouard Aynard 69100 Villeurbanne Tél. +33 (0)4 78 95 05 80 Fax +33 (0)4 78 95 00 17 www.passman.fr www.passman-hotels.com www.passman-camping.com www.passman-sante.com <https://www.facebook.com/PASSMAN-187787814053/>

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timestamptz conversion
by Robin Cijvat 29 Oct '15

29 Oct '15

Hi all, I am currently extending the NodeJS connector for MonetDB, that communicates with the mserver process using Mapi. However, I face some unexpected behavior when I insert timestamptz values into a table and then retrieve it. This is the Mapi: TX: sCREATE TABLE bar (a timestamptz); RX: &3 TX: sINSERT INTO bar VALUES ('2015-10-29 11:31:35.000000+01:00'); RX: &2 1 -1 TX: sSELECT * FROM bar; RX: &1 0 1 1 1 % sys.bar # table_name % a # name % timestamptz # type % 32 # length [ 2015-10-29 10:31:35.000000+00:00 ] As you can see, inserting the timestamptz string '2015-10-29 11:31:35.000000+01:00', results in it being stored as its equivalent '2015-10-29 10:31:35.000000+00:00'. If I do the same with mclient, this does not happen, and I get the exact same string back. Does anyone know why this might be happening?

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python module monetdblite
by Ben Jeffery 28 Oct '15

28 Oct '15

Hi, I'm aware the embedded "monetdblite" library isn't released yet - but it seems perfect for my use case so am very excited to try it. I've tried compiling the source from the pyapi branch but run into: "ImportError: /usr/local/lib/python2.7/dist-packages/monetdb5/lib/monetdb5/lib_pyapi.so: undefined symbol: batint_dec2_dbl" when I "import monetdblite" on Linux Mint 17 with python 2.7 or 3.4 Any chance of some build instructions for this module? Or do I just need to be patient for the release? :) Ta, Ben

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Selecting database at runtime?
by Dennis Pallett 28 Oct '15

28 Oct '15

Hi all, I'm pretty sure I already know the answer, but is it possible to select the database at runtime instead of "hardcoded" into the connection string? For example, my (JDBC) connection string would only be the MonetDB host (i.e. jdbc:monetdb://192.168.0.1/) and then I'd be able to execute a query to select the right database (e.g. SET DATABASE dbname). Best regards, Dennis

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Change default role of user
by Dennis Pallett 27 Oct '15

27 Oct '15

Hi, Is it possible to change the default role of a user? I want to avoid the step of having to execute the "SET ROLE role" statement before being able to run my queries. Best regards, Dennis Pallett

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