Table: bwf_juniors
Columns: year
boys_singles
girls_singles
boys_doubles
girls_doubles
mixed_doubles

Question: Which girls singles in 2012?
SQL: SELECT "girls_singles" FROM bwf_juniors WHERE "year" = 2012

Question: Which boys double was in 1998?
SQL: SELECT "boys_doubles" FROM bwf_juniors WHERE "year" = 1998

Question: Which is the earliest year that had mixed doubles for wang wei lu ying?
SQL: SELECT MIN("year") FROM bwf_juniors WHERE "mixed_doubles" = 'wang wei lu ying'