# Concepts

- [Metadata](/sdv/concepts/metadata.md)
- [Sdtypes](/sdv/concepts/metadata/sdtypes.md)
- [Metadata API](/sdv/concepts/metadata/metadata-api.md)
- [Metadata JSON](/sdv/concepts/metadata/metadata-json.md)
- [Constraint-Augmented Generation (CAG)](/sdv/concepts/constraint-augmented-generation-cag.md)
- [❖ Auto-Detect Constraints](/sdv/concepts/constraint-augmented-generation-cag/auto-detect-constraints.md)
- [Predefined Constraints](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints.md)
- [FixedCombinations](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/fixedcombinations.md)
- [FixedIncrements](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/fixedincrements.md)
- [Inequality](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/inequality.md)
- [OneHotEncoding](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/onehotencoding.md)
- [Range](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/range.md)
- [❖ CarryOverColumns](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/carryovercolumns.md)
- [❖ ChainedInequality](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/chainedinequality.md)
- [❖ DenormalizedTable](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/denormalizedtable.md)
- [❖ FixedNullCombinations](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/fixednullcombinations.md)
- [❖ ForeignToForeignKey](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/foreigntoforeignkey.md)
- [❖ ForeignToPrimaryKeySubset](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/foreigntoprimarykeysubset.md)
- [❖ MixedScales](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/mixedscales.md)
- [❖ Polymorphic Relationship](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/polymorphic-relationship.md)
- [❖ PrimaryToPrimaryKeySubset](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/primarytoprimarykeysubset.md)
- [❖ ReferenceTable](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/referencetable.md)
- [❖ SelfReferentialHierarchy](/sdv/concepts/constraint-augmented-generation-cag/predefined-constraints/selfreferentialhierarchy.md)
- [Program Your Own Constraint](/sdv/concepts/constraint-augmented-generation-cag/program-your-own-constraint.md)
- [Constraints API](/sdv/concepts/constraint-augmented-generation-cag/constraints-api.md)