  Causality has been recently introduced in databases, to model, characterize,
and possibly compute causes for query answers. Connections between QA-causality
and consistency-based diagnosis and database repairs (wrt. integrity constraint
violations) have already been established. In this work we establish precise
connections between QA-causality and both abductive diagnosis and the
view-update problem in databases, allowing us to obtain new algorithmic and
complexity results for QA-causality. We also obtain new results on the
complexity of view-conditioned causality, and investigate the notion of
QA-causality in the presence of integrity constraints, obtaining complexity
results from a connection with view-conditioned causality. The abduction
connection under integrity constraints allows us to obtain algorithmic tools
for QA-causality.
