Table: dan_tang_awards
Columns: year
award
category
nomination
result

Question: What category was danson tang nominated?
SQL: SELECT "category" FROM dan_tang_awards WHERE "nomination" = 'danson tang'

Question: What was the total number of years than had best improved singer (躍進歌手)?
SQL: SELECT SUM("year") FROM dan_tang_awards WHERE "category" = 'best improved singer (躍進歌手)'