December 2022 - 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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Announcement: New Sep2022-SP1 Bugfix release of MonetDB suite
by Sjoerd Mullender 09 Dec '22

09 Dec '22

The MonetDB team at MonetDB Solutions BV is pleased to announce the Sep2022-SP1 bugfix release of the MonetDB suite of programs. More information about MonetDB can be found on our website at <https://www.monetdb.org/>. For details on this release, please see the release notes at <https://www.monetdb.org/release-notes/sep2022/>. As usual, the download location is <https://www.monetdb.org/downloads/>. ### Client Package - Also dump the new options of CREATE USER. ### ODBC Driver - Fixed issue with generated raw strings prefix when ODBC driver is used against a server older than Jun2020 (11.37). ### MonetDB Common - On Windows, use the wide-character interface of system calls when dealing with the environment (i.e. file names and getenv()). - Memory leaks have been fixed. - Improved maintenance of the estimated number of distinct values in BATs. The estimate helps in deciding which low-level algorithm to use. - Offset heaps (.tailN files) were growing too fast and unnecessarily under certain conditions. This has been fixed. Also, when such too large files are now loaded into the system, it is recognized they are too large and they are truncated to a more reasonable size. ### MonetDB5 Server - Fixed a crash when the server runs out of client contexts (i.e. more concurrent clients than the server is configured to handle). - A race condition in the SHA hash code was fixed which resulted in occasional failed connection attempts when they occurred concurrently. - Fix a bug where the MAL optimizer would use the starttime of the previous query to determine whether a query timeout occurred. ### SQL Frontend - Improved the handling of the "idle" value in the sys.sessions function and view. ### Merovingian - Stop logging references to monetdbd's logfile in said logfile. ### Bug Fixes - [7330](https://github.com/MonetDB/MonetDB/issues/7330): Creating temporary table fails after reconnect - [7333](https://github.com/MonetDB/MonetDB/issues/7333): DLLs fail to load on Windows with accented characters in path - [7336](https://github.com/MonetDB/MonetDB/issues/7336): Selecting from a literal-value table returns wrong values - [7339](https://github.com/MonetDB/MonetDB/issues/7339): MonetDB corrupted state after SIGKILL - [7342](https://github.com/MonetDB/MonetDB/issues/7342): column which datatype is double couldn't group or aggregation in version 11.45.7

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