Question: What was the total Wandsworth spending in 2013 from the housing department?
SPARQL:
 select sum(xsd:decimal(?amount)) as ?result from <http://linkedspending.aksw.org/wandsworthspending_2013> { ?obs qb:dataSet ls:wandsworthspending_2013. ?obs lso:wandsworthspending_2013-Department "HOUSING". ?obs lso:wandsworthspending_2013-amount ?amount. }