# UniqueConstraint.h File Reference

`#include <FdoStd.h>`
`#include <Fdo/Schema/DataPropertyDefinitionCollection.h>`

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## Classes
class | FdoUniqueConstraint
| FdoUniqueConstraint can be used to specify that a property or list of properties taken together have unique values for all objects of that class in a datastore. A unique constraint that is based on a list of two or more properties is called a composite unique constraint. This constraint type applies to all data property types except for Boolean, BLOB, and CLOB. A Boolean property can be included if it is part of a composite unique constraint. More...
## Typedefs
typedef FdoPtr < FdoUniqueConstraint > | FdoUniqueConstraintP
| FdoUniqueConstraintP is a FdoPtr on FdoUniqueConstraint, provided for convenience.