Question: Calculate percentage of household segment in Indonesia.
SQL: SELECT CAST(SUM(IIF(T1.c_mktsegment = 'HOUSEHOLD', 1, 0)) AS REAL) * 100 / COUNT(T1.c_mktsegment) FROM customer AS T1 INNER JOIN nation AS T2 ON T1.c_nationkey = T2.n_nationkey WHERE T2.n_name = 'INDONESIA'