Comparing Database Schemas

Use this skill to analyze how two schemas differ and what those differences mean operationally.

Compare At These Levels

• Tables, columns, and data types.
• Nullability, defaults, and constraints.
• Indexes, keys, and unique guarantees.
• Views, triggers, and generated behavior if provided.
• Naming or semantic drift between versions.

What To Surface

• Additive versus breaking changes.
• Differences likely to affect application compatibility.
• Index or constraint gaps that may alter behavior.
• Migration sequencing concerns.
• Changes that look accidental rather than intentional.

Good Output

• Clear diff summary by object type.
• Breaking-risk assessment.
• Migration or rollout implications.
• Questions to ask before promoting the change.

Watch For

• Same column name with different semantics.
• Default or nullability changes that alter write behavior.
• Missing indexes in one environment causing performance drift.
• Silent removal of uniqueness or referential constraints.