user: Question: What is the episode # of the episode that aired on April 5, 1998?
Columns: ['Episode #', 'Title', 'Directed by', 'Written by', 'Original airdate']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['23 (1)', '"Hard Landing"', 'Jon Cassar', 'Michael Loceff', 'January 4, 1998']
SQL:

assistant: SELECT "Episode #" FROM "Table" WHERE "Original airdate" = 'April 5, 1998';