downloading folders from google drive.

I wanted to download some course material on RL shared by the author via Google drive using the command line.  I got a bunch of stuff using wget a folder in google drive was a challenge. I looked it up in SO which gave me a hint but no solution. I installed gdown using pip and then used: gdown --folder --continue https://drive.google.com/drive/folders/1V9jAShWpccLvByv5S1DuOzo6GVvzd4LV if there are more than 50 files you need to use --remaining-ok and only get the first 50. In such a case its best to download using the folder using the UI and decompress locally. Decompressing from the command line created errors related to unicode but using the mac UI I decompressed without a glitch.
Post a Comment

SQL - Selection v.s. Projection

Selection and projection are two high level processes taking place when SQL queries are executed.

Selection is choosing some records (rows) from a table and leaving others out. e.g. rows having name='oren'.
Projection is the choosing some columns from each record and leaving others out. e.g. only name.

So the select keyword performs projection while the where and keyword performs selection.

Clearly the choice of using the keyword select for projection (choosing columns) rather than choosing rows, is an unfortunate flaw in the design of SQL, but this oversight is too well established to be fixed.

Comments

Post a Comment

Popular posts from this blog

Moodle <=< Mediawiki SUL integration - first thoughts

Image
SUL is  Wikipedia's  Single User Login system The goal is to use it to authenticate moodle users there is one caveat - what happen if  the moodle user has no account. Moodle and MediaWiki account creation require different information. Since we'd like to use MediaWiki's standard which is highly permissive. It is necessary to change  moodle's requirements. Challenges Moodle does not explicitly define an object for setting registration requirements.  This needs to be accomplished by admins via edit a number of files manually.  errors will place the users in a limbo/blocked state... This is implemented differently on different version of moodle. This will break if the changes are overwritten by a system is upgrade. Directions Ideally Moodle should have a registration policy  object which allows the admin to define which fields are required and if they need to be unique . For example Moodle complains if different users share an email adr
Read more

downloading folders from google drive.

I wanted to download some course material on RL shared by the author via Google drive using the command line.  I got a bunch of stuff using wget a folder in google drive was a challenge. I looked it up in SO which gave me a hint but no solution. I installed gdown using pip and then used: gdown --folder --continue https://drive.google.com/drive/folders/1V9jAShWpccLvByv5S1DuOzo6GVvzd4LV if there are more than 50 files you need to use --remaining-ok and only get the first 50. In such a case its best to download using the folder using the UI and decompress locally. Decompressing from the command line created errors related to unicode but using the mac UI I decompressed without a glitch.
Read more

Insight into progressive web apps

Image
Some notes from a Meetup on PWAs in January 2016. I feel quite knowledgable on PWA but I wanted to learn more on implementing service worker. I ended up adding some research and collecting some great resources. However I ended up getting more detailed materials on the service worker based on google's developers docs. Also the resources have been expanded. https://www.meetup.com/The-Future-is-Javascript/events/246346861/ Service worker Service Workers Its just a simple JavaScript file that sits between you and the network – It runs in another thread – It has no access to DOM – It intercepts every network request (including cross domain) Entry point: self.caches (in service worker) or window.caches (on page)   Registering a Service Worker • Works with promises • Re-registration works fine In main.js navigator.serviceWorker.register('/sw.js').then(function(reg){ console.log('regsitered'); }.cat
Read more