CREATE TABLE table_12422 ("Constituency number" TEXT, "Name" TEXT, "Reserved for  (  SC / ST /None ) " TEXT, "District" TEXT, "Number of electorates  ( 2009 ) " FLOAT)

Name the District which has a Reserved for ( SC / ST /None) of sc?
SELECT "District" FROM table_12422 WHERE "Reserved for ( SC / ST /None)" = 'sc'
SELECT "District" FROM "table_12422" WHERE "Reserved for ( SC / ST /None)" = 'sc'