CREATE TABLE table_28796 ("Episode" FLOAT, "Title" CLOB, "Writer" CLOB, "Director" CLOB, "Original airdate" CLOB, "Ratings  ( Kanto ) " CLOB, "Ratings  ( Kansai ) " CLOB)

What is the original air date for the writer tanaka shinichi?
SELECT "Original airdate" FROM table_28796 WHERE "Writer" = 'Tanaka Shinichi'
SELECT "Original airdate" FROM "table_28796" WHERE "Writer" = 'Tanaka Shinichi'