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example of M:N relation between 2 tables

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Dataset Lightweight M:N

This data set demonstrates a basic M:N relationship between 2 tables
The dataset is targeted to show a slim implementation of M:N
It’s no question that other implementations exist. But at significant more storage consumption.

The first is a list of members in Developer Community counting badges gained in Global Masters
The second is the reference of assigned badges from Global Masters with their titles
So we have M members that refer to the multiple badges they gained + their count
To protect privacy the names of the members are encrypted.
And we have a set of N Bagdes that are assigned to several members + the count of members
related to that badge and the Ids to these members.

All datas result from the analysis of the member web pages in Developer Community
A utility for updates of ídentified members and the addition of new members is provided
The actual status reflects 10286 account pages downloaded and analyzed relating to 177 badges.

Relations are implemented as Lists of pure id’s (not oref to save space)

/// pure ID of awarded GM badges
Property Badges As List Of %Integer;

/// pure ID of assigned members
Property Members As List Of %Integer;

A few explanations on operation structures for further extension:

  • GM badges never change or get deleted - so they just can grow
  • DC members can get GM badges granted, but they will never lose it
    It is up to you to take care for correct maintenance of the M:N relations
    for DELETE or UPDATE of DC members. This is intentionally left open.

3 utility methods are provided:

  • Load(): this loads and analyzes the information presented on the member’s page
  • Upd() : runs over every defined member using Load() for actual values
  • New() : runs past the highest known MemberId and tries to find new ones
    MemberId’s are not given in closed sequence. So they can’t be predicted but only tried
  • To use these methods you will need to create a SSL Configuration named “community”
    in SMP for client access to community.intersystems.com:443 .
    This is included in Docker image setup


Make sure you have git and Docker desktop installed.


Clone/git pull the repo into any local directory

git clone https://github.com/isc-at/Dataset-simple-M-N.git

Run the IRIS container with your project:

docker-compose up -d --build

How to Test it

Connect to the containers SMP and examine content in namespace USER
applying the described examples
or use Online Demo

Example 1

  • find badges for specific members
  select name,title FROM dc_data_rcc.DCmember
  join dc_data_rcc.GMbadge on BadgeId %inlist (badges)
  where mbrid in (13081,65426) 
  order by 1,2
Name               Title
TYO\Q*]MR_MU      1,000 Points
TYO\Q*]MR_MU      Challenge Starter
TYO\Q*]MR_MU      DC Commenter
TYO\Q*]MR_MU      Open Sesame!
XQ[Z`Ue,YU_OTQZW[ 1,000 Points
XQ[Z`Ue,YU_OTQZW[ 5,000 Points
XQ[Z`Ue,YU_OTQZW[ Challenge Starter
XQ[Z`Ue,YU_OTQZW[ Open Sesame!

Example 2

  • find DCmembers that hold a specific GMbadge
  select title, name FROM dc_data_rcc.GMbadge
  join dc_data_rcc.DCmember on mbrid %inlist (members)
  where badgeid in (15,25)
  order by 1,2
Title                 Name
Conversation Starter  daTWdf2UW_bWd
Conversation Starter  fVbgg3UXXfba
Conversation Starter  HQMXV]$QEWPIRRMOSZ
Conversation Starter  LGHOGT&NG[VZ
Conversationalist     daTWdf2UW_bWd
Conversationalist     fgXc[Xa3WX3ZTUe\X__X
Conversationalist     fVbgg3UXXfba
Conversationalist     HEZMH$GPMJXI

Example 3

  • find DCWinners with GMbadge
   select Title,mbcnt, name,badgecount FROM dc_data_rcc.GMbadge b
   join dc_data_rcc.DCmember on mbrid %inlist(members)
   and title [ 'Winner'
   order by badgecount desc
Title				MbCnt	Name		BadgeCount
IRIS Contest Winner		12	daTWdf2UW_bWd		81
Silver IRIS Contest Winner	11	daTWdf2UW_bWd		81
Winner of AdventOfCOS2017	3	HQMXV]$QEWPIRRMOSZ	74
Winner of AdventOfCOS2018	3	HQMXV]$QEWPIRRMOSZ	74
IRIS Contest Winner		12	HQMXV]$QEWPIRRMOSZ	74
Bronze IRIS Contest Winner	8	HQMXV]$QEWPIRRMOSZ	74
Silver IRIS Contest Winner	11	HQMXV]$QEWPIRRMOSZ	74
Gold IRIS Contest Winner	7	HQMXV]$QEWPIRRMOSZ	74
IRIS Contest Winner		12	TYRX*W_\\Kc		55
Gold IRIS Contest Winner	7	TYRX*W_\\Kc		55
Winner of AdventOfCOS2017	3	`UdUb0cdUYgUb		43
Winner of AdventOfCOS2019	2	`UdUb0cdUYgUb		43
IRIS Contest Winner		12	PMVZQY]M(LQI[		43
Bronze IRIS Contest Winner	8	PMVZQY]M(LQI[		43
Silver IRIS Contest Winner	11	PMVZQY]M(LQI[		44
. . .  total 53 rows . . . 

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First published
06 Oct, 2021
Last checked by moderator
01 Nov, 2023Works