Small fix

Author: erezsh

data_diff/databases/database_types.py

@@ -53,8 +53,11 @@ class FractionalType(NumericType):
 class Float(FractionalType):
     pass
 
+class IKey(ABC):
+    "Interface for ColType, for using a column as a key in data-diff"
+    python_type: type
 
-class Decimal(FractionalType):
+class Decimal(FractionalType, IKey):    # Snowflake may use Decimal as a key
     @property
     def python_type(self) -> type:
         if self.precision == 0:
@@ -66,11 +69,6 @@ class StringType(ColType):
     pass
 
 
-class IKey(ABC):
-    "Interface for ColType, for using a column as a key in data-diff"
-    python_type: type
-
-
 class ColType_UUID(StringType, IKey):
     python_type = ArithUUID