-- Database schema
| divisions : division [ TEXT ] primary_key , name [ TEXT ] , country [ TEXT ] | matchs : Div [ TEXT ] matchs.Div = divisions.division , Date [ DATE ] , HomeTeam [ TEXT ] , AwayTeam [ TEXT ] , FTHG [ INTEGER ] , FTAG [ INTEGER ] , FTR [ TEXT ] , season [ INTEGER ] |
-- -- For all the games ended up with 1-1, what percentage of them are from Liga NOS division?

SELECT CAST(COUNT(CASE WHEN T2.name = 'Liga NOS' THEN T1.Div ELSE NULL END) AS REAL) * 100 / COUNT(T1.Div) FROM matchs AS T1 INNER JOIN divisions AS T2 ON T1.Div = T2.division WHERE T1.FTHG = 1 AND FTAG = 1;