Table: silpathorn_award_recipients
Columns: year
literature
music
film
performing_arts

Question: Name the average year for janaprakal chandruang
SQL: SELECT AVG("year") FROM silpathorn_award_recipients WHERE "performing_arts" = 'janaprakal chandruang'

Question: Name the literature for pradit prasarttong
SQL: SELECT "literature" FROM silpathorn_award_recipients WHERE "performing_arts" = 'pradit prasarttong'