Table: ncrha_seasons
Columns: no
season
championship
no_of_teams
start_reg_season
finish_incl_championship
top_record
national_champion

Question: What season ended on April 18?
SQL: SELECT "season" FROM ncrha_seasons WHERE "finish_incl_championship" = 'April 18'

Question: When did the season start that ended with the top record of Lindenwood (20–0–0)?
SQL: SELECT "start_reg_season" FROM ncrha_seasons WHERE "top_record" = 'Lindenwood (20–0–0)'

Question: What is the year range of season 4?
SQL: SELECT "season" FROM ncrha_seasons WHERE "no" = 4

Question: When is the finish of the season that started on September 25?
SQL: SELECT "finish_incl_championship" FROM ncrha_seasons WHERE "start_reg_season" = 'September 25'