Question: What are the top 3 expenditure categories in Cheshire West and Chester council spending?
SPARQL:
 select distinct(?result) from <http://linkedspending.aksw.org/cheshire_west_and_chester_april_2013> { ?obs qb:dataSet ls:cheshire_west_and_chester_april_2013. ?obs lso:cheshire_west_and_chester_april_2013-expenditure-category ?result. ?obs lso:cheshire_west_and_chester_april_2013-amount ?amount. } order by desc(sum(xsd:decimal(?amount))) limit 3