/docs/notes/architecture/data/ Recent content in Data on Piotr Kosmowski Hugo -- gohugo.io pl-pl /docs/notes/architecture/data/erd/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/architecture/data/erd/ Sure! Here are examples of One-to-One, One-to-Many, and Many-to-Many relationships with table schemas. 1. One-to-One (1:1) # A one-to-one relationship means each record in Table A corresponds to exactly one record in Table B. erDiagram Users ||--o| UserProfiles : "has one" Users { int user_id PK string username string email } UserProfiles { int profile_id PK int user_id FK string first_name string last_name string bio } Each user has exactly one profile. /docs/notes/architecture/data/scwd/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/architecture/data/scwd/ Overview # Slowly Changing Dimensions (SCD) are a key concept in data warehousing, used to manage and track changes to data over time. In dimensional modeling, particularly for star and snowflake schemas, it’s common for dimensions (such as customers, products, or locations) to change slowly over time. Managing these changes ensures historical accuracy and supports analytical queries. There are several types of SCD, each representing a different method of handling changes in the dimension data.