Merge branch 'main' of https://[email protected]/zzzamyatin/langu…

…ages

.github/workflows/create-diagram.yml

@@ -0,0 +1,17 @@
+name: Create diagram
+
+on:
+  workflow_dispatch: {}
+  push:
+    branches:
+      - main
+jobs:
+  get_data:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@master
+      - name: Update diagram
+        uses: githubocto/repo-visualizer@main
+        with:
+          excluded_paths: "ignore,.github"

README.md

@@ -2,3 +2,6 @@
 
 Cheatsheets for languages I speak
 https://zzzamyatin.github.io/languages/
+
+
+![Visualization of the codebase](./diagram.svg)

business_intelligence.md

@@ -0,0 +1,8 @@
+# Business Intelligence
+
+* Code-based BI https://evidence.dev/
+
+## Open source BI
+Apache Superset  
+Metabase  
+Yandex DataLens  

computer_science.md

@@ -3,4 +3,5 @@
 * https://composingprograms.com/ Python based
 
 # Principles
-* SOLID https://www.freecodecamp.org/news/solid-principles-for-programming-and-software-design/
+* SOLID https://www.freecodecamp.org/news/solid-principles-for-programming-and-software-design/
+* Versioning https://semver.org/

docker/README.md

@@ -0,0 +1,127 @@
+# Docker
+
+* https://docker-curriculum.com/
+* https://docs.docker.com/get-started
+* https://github.com/veggiemonk/awesome-docker
+* course https://www.udemy.com/course/learn-docker/
+* https://www.smarthomebeginner.com/best-docker-containers-for-home-server/
+* https://www.smarthomebeginner.com/docker-media-server-2022/
+
+## reverse proxy
+* caddy https://github.com/lucaslorentz/caddy-docker-proxy
+* traefik https://github.com/traefik/traefik
+* auth https://t.me/c/1675809627/2662
+
+## orchestration
+Kubernetes: https://www.udemy.com/course/learn-kubernetes  
+Portainer: https://github.com/portainer/portainer
+
+## automatic update
+* https://containrrr.dev/watchtower/
+
+## dashboard
+https://github.com/pawelmalak/flame
+
+
+
+## Images
+    $ docker search postgres
+    $ docker pull postgres
+    $ docker images
+
+## Volumes
+    $ docker volume create postgres-data
+    $ docker volume ls
+
+## Start a container
+    $ docker run postgres                       # run an image and exit
+    $ docker run postgres echo "Hello, world!"  # run an image and the command in it and exit
+    $ docker run -it postgres sh                # run an image with the shell and attach to it
+
+    $ docker run \
+        --name p1 \
+        -e POSTGRES_PASSWORD=lovesexgod               # set environment variable \
+        -P                                            # publish all opened ports random \
+        -p 5432:5432                                  # publish a specific port ext:int \
+        -v postgres-data:/var/lib/postgresql/data     # mount a volume ext:int \
+        --net MYNETWORK                               # put in the specific network \
+        -d                                            # detached mode \
+        -it                                           # interactive terminal \
+        --rm                                          # rm container after stop \
+        postgres                                      # which image to run. If an image is not pulled, it will be pulled automatically 
+
+    $ docker stack deploy -c stack.yml postgres
+
+## Dockerfile
+Dockerfile is the list of instructions to build an image
+
+    # define the parent image, to be inherited
+    FROM python:3.8
+    MAINTAINER Name Surname <[email protected]>
+    # mount a volume
+    ADD flask-app /opt/flask-app
+    WORKDIR /usr/src/app
+    # copy all the files to the container
+    COPY . .
+    # install dependencies
+    RUN pip install --no-cache-dir -r requirements.txt
+    EXPOSE 5000
+    CMD ["python", "./app.py"]
+
+    $ docker build -t USERNAME/IMAGENAME IMAGEROOTDIR    # Dockerfile must be in IMAGEROOTDIR
+
+## Distributing containers
+    $ git clone https://github.com/prakhar1989/FoodTrucks
+    $ cd FoodTrucks
+    $ ./setup-docker.sh
+
+setup-docker.sh:
+
+    #!/bin/bash
+
+    # build the flask container
+    docker build -t yourusername/foodtrucks-web .
+
+    # create the network
+    docker network create foodtrucks-net
+
+    # start the ES container
+    docker run -d --name es --net foodtrucks-net -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:6.3.2
+
+    # start the flask app container
+    docker run -d --net foodtrucks-net -p 5000:5000 --name foodtrucks-web yourusername/foodtrucks-web
+    Now imagine you are distributing your app to a friend, or running on a server that has docker installed. You can get a whole app running with just one command!
+
+
+
+
+
+## Docker Compose
+see [Docker Compose](docker-compose.md)
+
+## Work with containers
+    $ docker ps           # running containers only === $ docker container ls
+    $ docker ps -a        # all available containers
+    $ docker port p1      # see exposed ports
+
+    $ docker exec -it p1 psql -U postgres
+    $ docker exec -it p1 psql -U postgres -c "create database scores"
+
+    $ docker logs p1
+
+## Networks
+see [docker-network](docker-network.md)
+
+## Cool examples
+    $ docker run -it --rm alpine         # start fast & simple linux to try
+    $ docker run --rm alpine ping ya.ru  # run command and exit
+
+
+
+## Clean up
+    $ docker stop p1
+    $ docker rm p1
+    $ docker container prune            # rm all stopped containers
+    $ docker rmi postgres
+    $ docker volume rm postgres-data
+    $ docker network rm NETWORKNAME

docker/docker-compose.md

@@ -0,0 +1,29 @@
+# Docker Compose
+see [Docker](README.md)
+
+https://docs.docker.com/compose/overview  
+https://docs.docker.com/compose/compose-file  
+https://github.com/docker/awesome-compose
+
+## build images
+
+    $ docker-compose build
+
+
+## run
+
+step by step:
+
+    $ cd dir_with_docker-compose_yml
+    $ docker compose up
+
+oneliner:
+
+    $ docker compose 
+        [ -f docker-compose.yml ]    # YAML file location if not in PWD
+        -d                           # detached mode
+        up 
+
+## clean up
+    $ docker compose down \
+        -v                     # for verbose output

docker/docker-network.md

@@ -0,0 +1,65 @@
+# docker network
+see [Docker](README.md)
+
+https://docs.docker.com/engine/userguide/networking/dockernetworks/  
+
+Linux create docker network interface **docker0**  
+macOS and in Win hides docker in a VM behind the NAT
+
+
+    $ docker networks ls
+    bridge
+    host
+    none
+    macvlan
+    ipvlan
+    overlay  # docker swarm
+
+
+## bridge
+* an internal network  
+* by default  
+* the default bridge has no dns
+* multiple *bridge* networks are possible
+* manually created bridge networks becomes dns support  
+* :star: containers communicate within a bridge network  
+* :warning: containers in different networks can't communicate
+
+
+      $ docker network create [--drive bridge] MYNET
+      $ docker network create --subnet 192.168.10.0/24 --gateway 192.168.0.1 myCustomNet192
+      $ docker run --rm -it --name container1 --net MYNET -d nicolaka/netshoot
+      $ docker run --rm -it --name container2 --net MYNET nicolaka/netshoot /bin/bash
+        container2# ping container1
+
+      $ docker network connect MYNET2 container2  # one container can be connected to multiple networks (eg. proxy)
+      $ docker network disconnect container2
+
+        
+## host
+* fixed ip address
+* with communication between containers
+* only one *host* network is allowed
+
+      $ docker network create --drive host MYNETWORK
+      $ docker run nginx --network=host
+
+
+## none
+* no ip address
+* no communication between containers
+* only one *none* network is allowed
+
+      $ docker run nginx --network=none
+
+## macvlan
+* own physical mac-address for each container
+
+## ipvlan
+* own physical ip-address for each container
+
+
+
+
+## clean up
+    $ docker network rm NAME|ID

exasol/SELECT.md

@@ -55,7 +55,21 @@ https://docs.exasol.com/db/latest/sql/select.htm
     (POS | EXPR | ALIAS) [asc | desc] [nulls (first|last)]
 ## limit
 
+## union all
+https://docs.exasol.com/db/latest/sql/table_operators.htm
+A+B
 
 ## union
+https://docs.exasol.com/db/latest/sql/table_operators.htm
+A+B
+without duplicates
+
+## minus
+A-B  
+without duplicates  
+https://docs.exasol.com/db/latest/sql/table_operators.htm
+
 ## intersect
-## minus
+A*B  
+without duplicates  
+https://docs.exasol.com/db/latest/sql/table_operators.htm

exasol/diff_compare.md

@@ -10,22 +10,21 @@
       col4
     from t02 ),
 
-    t1_nur as ( select 'T1 only' as SRC, t.* from ( select * from t1 minus select * from t2 ) as t ),
-    t2_nur as ( select 'T2 only' as SRC, t.* from ( select * from t2 minus select * from t1 ) as t ),
-    t1_t2  as ( select 'both' as SRC, t.* from ( select * from t2 union select * from t1 ) as t ),
+    t1_nur as ( select 'T1 only' as SRC, t.* from ( select * from t1 minus     select * from t2 ) as t ),
+    t2_nur as ( select 'T2 only' as SRC, t.* from ( select * from t2 minus     select * from t1 ) as t ),
+    t1_t2  as ( select 'both'    as SRC, t.* from ( select * from t2 intersect select * from t1 ) as t ),
 
-    t1_t2_src as ( select * from ( 
+    t1_t2_src as ( 
                   select * from t1_t2
         union all select * from t1_nur
         union all select * from t2_nur
-      ) order by 2
     )
 
-    -- select * from t1_52_src;
+    --select * from t1_52_src order by 2;
 
     select SRC, count(*)
     from t1_t2_src
     group by SRC
     union all select 'T1 total', count(*) from t1
     union all select 'T2 total', count(*) from t2
-    ;
+    ;

exasol/operators.md

@@ -0,0 +1,44 @@
+# Exasol operators
+https://docs.exasol.com/db/latest/sql_references/predicates/overview.htm  
+https://docs.exasol.com/db/latest/sql_references/operators/overview.htm  
+
+## Predicates precedence
+1. =, !=, <, <=, >, >=
+2. [NOT] BETWEEN, EXISTS, [NOT] IN, IS [NOT] NULL, [NOT] REGEXP_LIKE, [NOT] LIKE, IS [NOT] JSON
+3. NOT
+4. AND
+5. OR
+
+## Operators precedence
+1. +, -, PRIOR, CONNECT_BY_ROOT (unary)
+2. ||
+3. *, /
+4. +, - (binary)
+
+## NULL in AND and OR
+    -- symmetric behaviour 
+    -- https://docs.exasol.com/db/latest/sql_references/predicates/logicaljoinpredicates.htm
+
+
+    select * from (
+
+      select null as "EXPRESSION",    null as "RESULT"
+      union select 'TRUE and NULL',   TRUE and NULL   -- = NULL
+      union select 'FALSE and NULL',  FALSE and NULL  -- = FALSE
+      union select 'NULL and TRUE',   NULL and TRUE   -- = NULL
+      union select 'NULL and FALSE',  NULL and FALSE  -- = FALSE
+      union select 'NULL and NULL',    NULL and NULL   -- = NULL
+      
+      union select 'TRUE or NULL',    TRUE or NULL    -- = TRUE
+      union select 'FALSE or NULL',   FALSE or NULL   -- = NULL
+      union select 'NULL or TRUE',    NULL or TRUE    -- = TRUE
+      union select 'NULL or FALSE',   NULL or FALSE   -- = NULL
+      union select 'NULL or NULL',    NULL or NULL    -- = NULL
+      
+      union select 'not NULL',        not NULL        -- = NULL
+
+    ) 
+    where EXPRESSION is not null
+    order by 2,1
+    ;
+