Models for hierarchical data

Tree-like data relationships are common, but working with trees in SQL usually requires awkward recursive queries. This talk describes alternative solutions in SQL, including: - Adjacency List - Path Enumeration - Nested Sets - Closure Table Code examples will show using these designs in PHP, and offer guidelines for choosing one design over another.Read less

[delphinus35]

木構造をRDBで再現する閉包テーブルの説明。他のパターンの例も豊富。

[k4200]

Closure Table