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| 分层数据库 | |||
| 层次数据库 | |||
| 层次式数据库 | |||
| 层次型数据库 | |||
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| 层次型数据库 | |||
| English thesaurus | |||
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| A database structured in a tree/root or parent/child relationship (Each parent can have many children, but each child may have only one parent) | |||
| hierarchical database: 7 phrases in 3 subjects |
| Electronics | 2 |
| Information technology | 4 |
| Project management | 1 |