Table: sim_kwon_ho_wrestling
Columns: opponent
res
class
score
date
competition
notes

Question: WHAT COMPETITION HAS MARIAN SANDU?
SQL: SELECT "competition" FROM sim_kwon_ho_wrestling WHERE "res" = 'marian sandu'

Question: WHAT SCORE WAS ON 1999-05-31?
SQL: SELECT "score" FROM sim_kwon_ho_wrestling WHERE "date" = '1999-05-31'

Question: WHAT OPPONENT HAD A SCORE OF 5:5?
SQL: SELECT "opponent" FROM sim_kwon_ho_wrestling WHERE "score" = '5:5'