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Update DESIGN-PRINCIPLES.md #231

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7 changes: 6 additions & 1 deletion DESIGN-PRINCIPLES.md
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Expand Up @@ -247,8 +247,13 @@ The following columns should be present in all tables unless there is a compelli
- many-to-many: `link_apples_oranges`
- Link tables should have unique constraints reflective of the particular relationship:
- one-to-one: separate unique constraints on each foreign key column
- one-to-many: unique constraint on the `one` column
- `unique(apple_id)`
- `unique(orange_id)`
- many-to-many: single unique constraint encompassing *both* columns
- `unique(apple_id, orange_id)`
- one-to-many: unique constraint on the `one` column, and a *separate* unique constraint for both columns
- `unique(apple_id)`
- `unique(apple_id, orange_id)`

# SQLAlchemy

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