Relationships, Cardinality, and the Questions Your Schema Is Asking
The article discusses the importance of understanding relationships and cardinality in database design. It emphasizes the need to accurately model data relationships to avoid common mistakes that can complicate data management. The author outlines the three main types of relationships: one-to-one, one-to-many, and many-to-many, providing insights into their proper implementation.
- ▪One-to-one relationships are less common and should only be used when there is a genuine reason for data separation.
- ▪One-to-many relationships are the most common in relational data modeling, with the foreign key residing on the 'many' side.
- ▪Many-to-many relationships require a pivot table to connect records from both sides.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 95943) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Steve McDougall Posted on May 19 • Originally published at juststeveking.com Relationships, Cardinality, and the Questions Your Schema Is Asking #erd #cardinality #databasedesign #datamodeling from-requirements-to-reality (10 Part Series) 1 Stop Writing Code First 2 Reading Between the Lines ... 6 more parts...
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