How many were promoted from the league when Esher was relegated to the league?
CREATE TABLE "table1_23927423_4" (
  "season" text,
  "name" text,
  "teams" real,
  "relegated_to_league" text,
  "promoted_to_league" text,
  "promoted_from_league" text,
  "relegated_from_league" text
);
SELECT COUNT("promoted_from_league") FROM "table1_23927423_4" WHERE "relegated_to_league"='Esher';