Table: wales_election_2011
Columns: date_s_conducted
cons
plaid_cymru
lib_dem
ukip
green
others
lead

Question: On 5 May 2011, what was the lead percentage?
SQL: SELECT "lead" FROM wales_election_2011 WHERE "date_s_conducted" = '5 may 2011'

Question: On what date was the lead 8.6%?
SQL: SELECT "date_s_conducted" FROM wales_election_2011 WHERE "lead" = '8.6%'