databases.md

Databases

SQL

https://gvwilson.github.io/sql-tutorial/

PostgreSQL

Docker compose

  postgres_db:
    image: postgres
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=some_password
      - POSTGRES_DB=my_db_name
    ports:
      - 5432:5432
    volumes:
      - ./path_to_migration_scripts:/docker-entrypoint-initdb.d/  # this will run all scripts in the folder
    healthcheck:
      test: ["CMD", "pg_isready", "-U", "postgres"]
      interval: 1s
      timeout: 3s
      retries: 30

In the container, run:

psql postgresql://"$POSTGRES_USER":"$POSTGRES_PASSWORD"@"$POSTGRES_HOST":5432/"$POSTGRES_DB"

From outside the container, run:

psql postgresql://postgres:some_password@postgres_db:5432/my_db_name

UUID

UUID as primary key:

• https://www.cybertec-postgresql.com/en/unexpected-downsides-of-uuid-keys-in-postgresql/
• https://news.ycombinator.com/item?id=40884878
• https://planetscale.com/blog/the-problem-with-using-a-uuid-primary-key-in-mysql#use-an-ordered-uuid-variant

Links

• https://postgres.ai/blog/20230722-10-postgres-tips-for-beginners
• https://postgres.ai/blog/20220525-common-db-schema-change-mistakes
• https://wiki.postgresql.org/wiki/Don%27t_Do_This#Text_storage
• https://wiki.postgresql.org/wiki/Don%27t_Do_This#Don.27t_use_upper_case_table_or_column_names