Data Dictionary Builder
Every data element named, typed and described.
| Name | Type | Length | Meaning | |
|---|---|---|---|---|
| member_id | INTEGER | 4 | Unique member number | |
| isbn | CHAR | 13 | International book number | |
| due_date | DATE | 10 | Expected return date |
The dictionary complements the ERD: it pins down each attribute's domain so designers and DBAs agree on storage, validation and display formats before any code is written.