CREATE TABLE table_70493 ("Venue" CLOB, "City" CLOB, "Tickets Sold / Available" CLOB, "Gross Revenue  ( 1986 ) " CLOB, "Gross Revenue  ( 2011 ) " CLOB)

How many tickets were there sold/available in Barcelona?
SELECT "Tickets Sold / Available" FROM table_70493 WHERE "City" = 'barcelona'
SELECT "Tickets Sold / Available" FROM "table_70493" WHERE "City" = 'barcelona'