CREATE TABLE table_18125 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Results" CLOB, "Candidates" CLOB)

when was the first elected for districk oklahoma 1?
SELECT "First elected" FROM table_18125 WHERE "District" = 'Oklahoma 1'
SELECT "First elected" FROM "table_18125" WHERE "District" = 'Oklahoma 1'