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Update README.md #178

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IlyaFaer merged 2 commits into from
Dec 21, 2021
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Update README.md #178

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Expand Up @@ -119,9 +119,11 @@ client = Table(
spanner_interleave_in="team",
spanner_interleave_on_delete_cascade=True,
)
client.add_is_dependent_on(team)

client.create(engine)
```
**Note**: Interleaved tables have a dependency between them, so the parent table must be created before the child table. When creating tables with this feature, make sure to call `add_is_dependent_on()` on the child table to request SQLAlchemy to create the parent table before the child table.

### Unique constraints
Cloud Spanner doesn't support direct UNIQUE constraints creation. In order to achieve column values uniqueness UNIQUE indexes should be used.
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