CREATE TABLE "table1_25800134_12" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "airdate" text
);

Question: What episode  number of the series aired on February 26, 1968?
SQL: SELECT "series_num" FROM "table1_25800134_12" WHERE "airdate"='February 26, 1968';

Question: How many people directed the episode that aired on February 5, 1968?
SQL: SELECT COUNT("director") FROM "table1_25800134_12" WHERE "airdate"='February 5, 1968';

Question: Who directed the episode that aired on September 25, 1967?
SQL: SELECT "director" FROM "table1_25800134_12" WHERE "airdate"='September 25, 1967';

Question: Who directed the episode that aired on February 19, 1968?
SQL: SELECT "director" FROM "table1_25800134_12" WHERE "airdate"='February 19, 1968';

Question: How many episode titles aired on September 25, 1967?
SQL: SELECT COUNT("title") FROM "table1_25800134_12" WHERE "airdate"='September 25, 1967';