Return the number of rows in the given relation.
- Return type
Number of rows in the relation as an integer.
>>> import patito as pt >>> relation = pt.Relation("select 1 as a") >>> relation.count() 1 >>> (relation + relation).count() 2
The Relation.__len__() method invokes
Relation.count()under the hood, and is equivalent:
>>> len(relation) 1 >>> len(relation + relation) 2