See the new site: https://postgresisenough.dev
Free O'Reilly books and convenient script to just download them.
Thanks /u/FallenAege/ and /u/ShPavel/ from this Reddit post
How to use:
- Take the
download.shfile and put it into a directory where you want the files to be saved. cdinto the directory and make sure that it has executable permissions (chmod +x download.shshould do it)- Run
./download.shand wee there it goes. Also if you do not want all the files, just simply comment the ones you do not want.
Cassandra is a NoSQL database, and is meant for different applications than traditional relational databases. Nevertheless, developers will want (and try) to implement RDBMS features in Cassandra. Unique constraints is one such example.
Many people have asked about creating unique constraints in Cassandra: 1, 2, 3, 4. There is no definitive answer. The most popular answer seems to be to not even try it. Square peg, round hole. If you need unique constraints, Cassandra may not be the tool for the job. Others have suggested to use LWT/CAS. It should be noted that, simply using LWT/CAS does not give us reliable unique constraints that we get i
FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
- By Edmond Lau
- Highly Recommended 👍
- http://www.theeffectiveengineer.com/
Free O'Reilly books and convenient script to just download them.
Thanks /u/FallenAege/ and /u/ShPavel/ from this Reddit post
How to use:
- Take the
download.shfile and put it into a directory where you want the files to be saved. cdinto the directory and make sure that it has executable permissions (chmod +x download.shshould do it)- Run
./download.shand wee there it goes. Also if you do not want all the files, just simply comment the ones you do not want.
Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.
A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.
val square : Int => Int = x => x * x| # see https://www.topbug.net/blog/2013/04/14/install-and-use-gnu-command-line-tools-in-mac-os-x/ | |
| # core | |
| brew install coreutils | |
| # key commands | |
| brew install binutils | |
| brew install diffutils | |
| brew install ed --default-names | |
| brew install findutils --with-default-names |
Picking the right architecture = Picking the right battles + Managing trade-offs
- Clarify and agree on the scope of the system
- User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?